Server Error in '/' Application.

---

Key cannot be null.
Parameter name: key

Line 179:                */
Line 180:
Line 181:                string strCheckForNode = umbraco.library.QueryForNode(strNodeID);
Line 182:
Line 183:                if (strCheckForNode == string.Empty)

Source File: c:\websites\LynchburgPawnShop.com\usercontrols\website\EmailAFriendForm.ascx.cs    Line: 181

Stack Trace:

[ArgumentNullException: Key cannot be null.
Parameter name: key]
   System.Collections.Hashtable.get_Item(Object key) +12645667
   System.Xml.XmlDocument.GetElementById(String elementId) +49
   umbraco.library.QueryForNode(String id) +62
   umbracowebsitewizard_site.Usercontrols.EmailAFriendForm.Page_Load(Object sender, EventArgs e) in c:\websites\LynchburgPawnShop.com\usercontrols\website\EmailAFriendForm.ascx.cs:181
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +25
   System.Web.UI.Control.LoadRecursive() +71
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3048

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1

using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

// Extra Namespaces we have imported
using System.Net;
using System.Net.Mail;
using System.Net.Configuration;
using System.Text.RegularExpressions;
using System.Configuration;
using System.Web.Configuration;
using System.Xml;
using System.Text;
using System.IO;

using umbraco;
using umbraco.presentation.nodeFactory;

namespace umbracowebsitewizard_site.Usercontrols
{
    public partial class EmailAFriendForm : System.Web.UI.UserControl
    {
        #region Properties from Umbraco

        private string _EmailSubjectToFriend, _EmailMessageToFriend, _EmailFrom, _FormHeader, _ThankYouHeaderText, _ThankYouMessageText;
        private bool _EnableSSL;

        public string EmailSubjectToFriend
        {
            get
            {
                return _EmailSubjectToFriend;
            }
            set
            {
                _EmailSubjectToFriend = value;
            }
        }

        public string EmailMessageToFriend
        {
            get
            {
                return _EmailMessageToFriend;
            }
            set
            {
                _EmailMessageToFriend = value;
            }
        }

        public string EmailFrom
        {
            get
            {
                return _EmailFrom;
            }
            set
            {
                _EmailFrom = value;
            }
        }

        public string FormHeader
        {
            get
            {
                return _FormHeader;
            }
            set
            {
                _FormHeader = value;
            }
        }

        public string ThankYouHeaderText
        {
            get
            {
                return _ThankYouHeaderText;
            }
            set
            {
                _ThankYouHeaderText = value;
            }
        }

        public string ThankYouMessageText
        {
            get
            {
                return _ThankYouMessageText;
            }
            set
            {
                _ThankYouMessageText = value;
            }
        }

        public bool EnableSSL
        {
            get
            {
                return _EnableSSL;
            }
            set
            {
                _EnableSSL = value;
            }
        }

        #endregion

        #region PageEvents

        protected void Page_Load(object sender, EventArgs e)
        {

            /*
            ========================================================
            Get the variables from the form and populate the
            literal controls on the usercontrol .ascx file
            ========================================================
            */

            // Get the currentNode and call it currentNode
            Node currentNode = Node.GetCurrent();

            /*
            ========================================================
            Build up the formHeader text as follows.
            The node name in strong to make it pink in sIFR and
            then our FormHeaderText from our node we are passing in
            ========================================================
            */
            formHeader.Text = "<strong>" + currentNode.Name + ".</strong>";



            //Set these back to empty strings             
            emailLink.NavigateUrl = string.Empty;
            emailLink.Text = string.Empty;


            /*
            ========================================================
            Lets check if an ID is being passed to the
            page if not display error
            ========================================================
            */

            string strNodeID = Request.QueryString["id"];

            if (strNodeID == string.Empty)
            {
                /*
                ========================================================
                NO nodeID passed in. So display error message
                ========================================================
                */

                //Set the label control text property with an error message.
                errorMessage.Text = "You are missing a nodeID. Please go back and try again.";

                //Make the div with ID = error visible
                Error.Visible = true;

                //Stop everything we are doing and exit.
                return;
            }
            else
            {
                /*
                ========================================================
                FOUND an ID in querystring - Lets check its not made up
                ========================================================
                */

                string strCheckForNode = umbraco.library.QueryForNode(strNodeID);

                if (strCheckForNode == string.Empty)
                {
                    /*
                     ========================================================
                     Querystring not a valid node ID - show error
                     ========================================================
                     */

                    //Set the label control text property with an error message.
                    errorMessage.Text = "The nodeID does not exist. Please go back and try again.";

                    //Make the div with ID = error visible
                    Error.Visible = true;

                    //Stop everything we are doing and exit.
                    return;
                }
            }

            //Call BuildLink function with our nodeID querystring
            string strURL = BuildLink(Convert.ToInt32(Request.QueryString["id"]));

            //Set the text with our link we got back from BuildLink that is set in strURL
            emailLink.NavigateUrl = strURL;
            emailLink.Text = strURL;

        }

        public void btnSubmit_Click(object sender, EventArgs e)
        {

            //Proceed only if the vaidation is successfull
            if (!Page.IsValid)
            {
                //Stop everything we are doing and exit.
                return;
            }


            /*
            ========================================================
            Get the variables from the form and set them in strings
            ========================================================
            */

            string strFriendsName, strFriendsEmail, strYourName, strYourEmail,
                    strEmailSubject, strEmailBody, strMessage, strTime, strDate, strURL;

            strFriendsName = friendsName.Text;      //This is the friends name that the user is sending it to.
            strFriendsEmail = friendsEmail.Text;    //This variable will be used to send the email to.

            strYourName = yourName.Text;            //This is the persons name who filled in the form.
            strYourEmail = yourEmail.Text;          //This vairable is used to send as the email 'from'
            strMessage = yourMessage.Text;          //This is the users message to their friend.

            strEmailSubject = EmailSubjectToFriend; //This is the subject line for the email that be sent to the Friend.
            strEmailBody = EmailMessageToFriend;    //This is the main email text that will be sent that has the placeholders in.

            strTime = String.Format("{0:HH:mm:ss}", DateTime.Now);      //This is the current time in format of 17:04:53
            strDate = String.Format("{0:dd/MM/yyyy}", DateTime.Now);    //This is the current date in format of 10/02/2009


            strURL = BuildLink(Convert.ToInt32(Request.QueryString["ID"]));


            /*
            ========================================================
            Find and Replace [FriendName]
            ========================================================
            */
            strEmailBody = strEmailBody.Replace("[FriendName]", strFriendsName);

            /*
            ========================================================
            Find and Replace [FriendEmail]
            ========================================================
            */
            strEmailBody = strEmailBody.Replace("[FriendEmail]", strFriendsEmail);

            /*
            ========================================================
            Find and Replace [YourName]
            ========================================================
            */
            strEmailBody = strEmailBody.Replace("[YourName]", strYourName);

            /*
            ========================================================
            Find and Replace [YourEmail]
            ========================================================
            */
            strEmailBody = strEmailBody.Replace("[YourEmail]", strYourEmail);


            /*
            ========================================================
            Find and Replace [Message]
            ========================================================
            */
            strEmailBody = strEmailBody.Replace("[Message]", strMessage);


            /*
            ========================================================
            Find and Replace [Date]
            ========================================================
            */
            strEmailBody = strEmailBody.Replace("[Date]", strDate);

            /*
            ========================================================
            Find and Replace [Time]
            ========================================================
            */
            strEmailBody = strEmailBody.Replace("[Time]", strTime);


            /*
            ========================================================
            Find and Replace [URL]
            ========================================================
            */
            strEmailBody = strEmailBody.Replace("[URL]", strURL);


            /*
            ========================================================
            Find and Replace [FriendName]
            ========================================================
            */
            strEmailSubject = strEmailSubject.Replace("[FriendName]", strFriendsName);


            /*
            ==============================================================
            Find and Replace [FriendEmail]
            ==============================================================
            */
            strEmailSubject = strEmailSubject.Replace("[FriendEmail]", strFriendsEmail);


            /*
            ==============================================================
            Find and Replace [YourName]
            ==============================================================
            */
            strEmailSubject = strEmailSubject.Replace("[YourName]", strYourName);


            /*
            ==============================================================
            Find and Replace [YourEmail]
            ==============================================================
            */
            strEmailSubject = strEmailSubject.Replace("[YourEmail]", strYourEmail);


            /*
            ==============================================================
            Find and Replace [Message]
            ==============================================================
            */
            strEmailSubject = strEmailSubject.Replace("[Message]", strMessage);


            /*
            ==============================================================
            Find and Replace [Date]
            ==============================================================
            */
            strEmailSubject = strEmailSubject.Replace("[Date]", strDate);


            /*
            ==============================================================
            Find and Replace [Time]
            ==============================================================
            */
            strEmailSubject = strEmailSubject.Replace("[Time]", strTime);


            /*
            ==============================================================
            Find and Replace [URL]
            ==============================================================
            */
            strEmailSubject = strEmailSubject.Replace("[URL]", strURL);




            /*
            ===========================================================
            Lets setup the SMTP client using settings from web.config
            ===========================================================
            */
            SmtpClient mySMTPClient = new SmtpClient();

            //If EnableSSL set to true lets enable it on our SMTP object.
            if (EnableSSL)
            {
                mySMTPClient.EnableSsl = true;
            }

            /*
            ===============================================================
            TRY to send email using the web.config settings to site owner
            ===============================================================
            */
            try
            {
                mySMTPClient.Send(EmailFrom, strFriendsEmail, strEmailSubject, strEmailBody);
            }
            catch (SmtpException ex)
            {
                //If mail fails to send for any reason
                errorMessage.Text = ex.Message;
                Error.Visible = true;
                FormFields.Visible = true;

                //If we fail to send email immediately stop runnning code
                return;
            }

            /*
            ========================================================
            Log the item to the XML file
            ========================================================
            */
            logItem(strURL, strFriendsName, strFriendsEmail, strYourName, strYourEmail, strMessage);


            /*
            ========================================================
            Set Thankyou text from our contact node in our
            hidden thankyou DIV
            ========================================================
            */
            thankyouHeader.Text = ThankYouHeaderText;
            thankyouMessage.Text = ThankYouMessageText;

            /*
            ========================================================
            Hide & Show div's to show our thankyou message
            ========================================================
            */
            FormFields.Visible = false;         //Hide the FormFields DIV
            Error.Visible = false;              //Hide the Error DIV
            ThankYou.Visible = true;            //SHOW our thankyou message DIV


        }

        private string BuildLink(int strNodeID)
        {
            Node pageFromNodeID = new Node(strNodeID);
            return "http://" + Request.ServerVariables["SERVER_NAME"] + pageFromNodeID.NiceUrl;    //Set our variable to be the currentPage's URL             
        }

        //Call this to log the email a friend form to XML file.
        private void logItem(string strURL, string strFriendName, string strFriendEmail, string strYourName, string strYourEmail, string strMessage)
        {
            string strTime = String.Format("{0:HH:mm:ss}", DateTime.Now);
            string strDate = String.Format("{0:dd/MM/yyyy}", DateTime.Now);

            string filePath = Server.MapPath("~/data/email_a_friend_form_log.xml");


            //Check if XML file exists
            if (!File.Exists(filePath))
            {
                //XML file DOES not exist yet.

                // Create a new XmlTextWriter instance
                XmlTextWriter writer = new XmlTextWriter(filePath, Encoding.UTF8);

                //Set the XML writer to indent the XML as opposed to all one line.
                writer.Formatting = Formatting.Indented;

                // start writing XML!
                writer.WriteStartDocument();

                // Create the <logs> root XML node
                writer.WriteStartElement("logs");

                // Creating the <log> node
                writer.WriteStartElement("log");

                // Adding the time attribute to the <log> node. <log time="14:52:23">
                writer.WriteAttributeString("time", strTime);

                // Adding the date attribute to the <log> node. <log time="14:52:23" date="22/02/2009">
                writer.WriteAttributeString("date", strDate);


                /*
                ========================================================
                Add the <field alias="url"> node
                ========================================================
                */
                // Creating the <field> node inside the <log> node
                writer.WriteStartElement("field");

                //Add the alias attribute to the <field> node. <field alias="url">
                writer.WriteAttributeString("alias", "url");

                //Write value of the field node.
                writer.WriteString(strURL);

                //Close the <field> node inside the <log> node
                writer.WriteEndElement();


                /*
                ========================================================
                Add the <field alias="friendName"> node
                ========================================================
                */

                // Creating the <field> node inside the <log> node
                writer.WriteStartElement("field");

                //Add the alias attribute to the <field> node. <field alias="friendName">
                writer.WriteAttributeString("alias", "friendName");

                //Write value of the field node.
                writer.WriteString(strFriendName);

                //Close the <field> node inside the <log> node
                writer.WriteEndElement();


                /*
                ========================================================
                Add the <field alias="friendEmail"> node
                ========================================================
                */

                // Creating the <field> node inside the <log> node
                writer.WriteStartElement("field");

                //Add the alias attribute to the <field> node. <field alias="friendEmail">
                writer.WriteAttributeString("alias", "friendEmail");

                //Write value of the field node.
                writer.WriteString(strFriendEmail);

                //Close the <field> node inside the <log> node
                writer.WriteEndElement();


                /*
                ========================================================
                Add the <field alias="yourName"> node
                ========================================================
                */

                // Creating the <field> node inside the <log> node
                writer.WriteStartElement("field");

                //Add the alias attribute to the <field> node. <field alias="yourName">
                writer.WriteAttributeString("alias", "yourName");

                //Write value of the field node.
                writer.WriteString(strYourName);

                //Close the <field> node inside the <log> node
                writer.WriteEndElement();


                /*
                ========================================================
                Add the <field alias="yourEmail"> node
                ========================================================
                */

                // Creating the <field> node inside the <log> node
                writer.WriteStartElement("field");

                //Add the alias attribute to the <field> node. <field alias="yourEmail">
                writer.WriteAttributeString("alias", "yourEmail");

                //Write value of the field node.
                writer.WriteString(strYourEmail);

                //Close the <field> node inside the <log> node
                writer.WriteEndElement();


                /*
                ========================================================
                Add the <field alias="message"> node
                ========================================================
                */
                // Creating the <field> node inside the <log> node
                writer.WriteStartElement("field");

                //Add the alias attribute to the <field> node. <field alias="message">
                writer.WriteAttributeString("alias", "message");

                //Write value of the field node, wrapped inside a CData tag
                writer.WriteCData(strMessage);

                //Close the <field> node inside the <log> node
                writer.WriteEndElement();



                //Close the <log> node
                writer.WriteEndElement();

                //Close the <logs> node
                writer.WriteEndDocument();

                //Stop using the XML writer & close the XML file.
                writer.Close();

            }
            else
            {
                //XML file already exists so lets add to the XML file.

                //Open up the XML file we already have.
                XmlDocument xmlDoc = new XmlDocument();
                xmlDoc.Load(filePath);


                //Create a new XML <log> node
                XmlElement logNode = xmlDoc.CreateElement("log");

                // Adding the time attribute to the <log> node. <log time="14:52:23">
                logNode.SetAttribute("time", strTime);

                // Adding the date attribute to the <log> node. <log time="14:52:23" date="22/02/2009">
                logNode.SetAttribute("date", strDate);


                /*
                ========================================================
                Add the <field alias="url"> node
                ========================================================
                */

                //Create a new xml <field> node
                XmlElement fieldNodeURL = xmlDoc.CreateElement("field");

                //Add the alias attribute to the <field> node. <field alias="url">
                fieldNodeURL.SetAttribute("alias", "url");

                //Write value of the field node.
                fieldNodeURL.InnerText = strURL;

                //Add our <field> node to our <log> node
                logNode.AppendChild(fieldNodeURL);

                /*
                ========================================================
                Add the <field alias="friendName"> node
                ========================================================
                */

                //Create a new xml <field> node
                XmlElement fieldNodeFriendName = xmlDoc.CreateElement("field");

                //Add the alias attribute to the <field> node. <field alias="friendName">
                fieldNodeFriendName.SetAttribute("alias", "friendName");

                //Write value of the field node.
                fieldNodeFriendName.InnerText = strFriendName;

                //Add our <field> node to our <log> node
                logNode.AppendChild(fieldNodeFriendName);


                /*
                ========================================================
                Add the <field alias="friendEmail"> node
                ========================================================
                */

                //Create a new xml <field> node
                XmlElement fieldNodeFriendEmail = xmlDoc.CreateElement("field");

                //Add the alias attribute to the <field> node. <field alias="friendEmail">
                fieldNodeFriendEmail.SetAttribute("alias", "friendEmail");

                //Write value of the field node.
                fieldNodeFriendEmail.InnerText = strFriendEmail;

                //Add our <field> node to our <log> node
                logNode.AppendChild(fieldNodeFriendEmail);


                /*
                ========================================================
                Add the <field alias="yourName"> node
                ========================================================
                */

                //Create a new xml <field> node
                XmlElement fieldNodeYourName = xmlDoc.CreateElement("field");

                //Add the alias attribute to the <field> node. <field alias="yourName">
                fieldNodeYourName.SetAttribute("alias", "yourName");

                //Write value of the field node.
                fieldNodeYourName.InnerText = strYourName;

                //Add our <field> node to our <log> node
                logNode.AppendChild(fieldNodeYourName);

                /*
                ========================================================
                Add the <field alias="yourEmail"> node
                ========================================================
                */

                //Create a new xml <field> node
                XmlElement fieldNodeYourEmail = xmlDoc.CreateElement("field");

                //Add the alias attribute to the <field> node. <field alias="yourEmail">
                fieldNodeYourEmail.SetAttribute("alias", "yourEmail");

                //Write value of the field node.
                fieldNodeYourEmail.InnerText = strYourEmail;

                //Add our <field> node to our <log> node
                logNode.AppendChild(fieldNodeYourEmail);


                /*
                ========================================================
                Add the <field alias="message"> node
                ========================================================
                */

                //Create a new xml <field> node
                XmlElement fieldNodeMessage = xmlDoc.CreateElement("field");

                //Add the alias attribute to the <field> node. <field alias="message">
                fieldNodeMessage.SetAttribute("alias", "message");

                //Create a CDATA section that wraps the message text
                XmlCDataSection fieldNodeCData = xmlDoc.CreateCDataSection(strMessage);

                //Add our cdata tag/node to our <field> node
                fieldNodeMessage.AppendChild(fieldNodeCData);

                //Add our <field> node to our <log> node
                logNode.AppendChild(fieldNodeMessage);


                //Add our built up logNode that contains our <field> nodes to the main xml document
                xmlDoc.SelectSingleNode("/logs").AppendChild(logNode);


                //Save the file
                xmlDoc.Save(filePath);
            }

        }


        #endregion

        #region validation
        protected void RequiredFriendName_ServerValidate(object source, ServerValidateEventArgs args)
        {
            if (friendsName.Text == String.Empty)
            {
                friendsName.CssClass = "error";
                args.IsValid = false;
            }
            else
            {
                friendsName.CssClass = "";
                args.IsValid = true;
            }
        }

        protected void RequiredFriendEmail_ServerValidate(object source, ServerValidateEventArgs args)
        {
            if (friendsEmail.Text == String.Empty)
            {
                friendsEmail.CssClass = "error";
                args.IsValid = false;
            }
            else
            {
                friendsEmail.CssClass = "";
                args.IsValid = true;
            }
        }


        protected void RequiredFieldYourName_ServerValidate(object source, ServerValidateEventArgs args)
        {
            if (yourName.Text == String.Empty)
            {
                yourName.CssClass = "error";
                args.IsValid = false;
            }
            else
            {
                yourName.CssClass = "";
                args.IsValid = true;
            }
        }

        protected void RequiredFieldYourEmail_ServerValidate(object source, ServerValidateEventArgs args)
        {
            if (yourEmail.Text == String.Empty)
            {
                yourEmail.CssClass = "error";
                args.IsValid = false;
            }
            else
            {
                yourEmail.CssClass = "";
                args.IsValid = true;
            }
        }

        protected void CheckFriendEmail_ServerValidate(object source, ServerValidateEventArgs args)
        {

            //Email Regex String
            Regex reg = new Regex(@"\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*");

            // Check if there is NO match in Regex
            if (!reg.IsMatch(friendsEmail.Text))
            {
                //Does not match RegEx - Invalid email address

                friendsEmail.CssClass = "error";
                args.IsValid = false;
            }
            else
            {
                friendsEmail.CssClass = "";
                args.IsValid = true;
            }
        }

        protected void CheckYourEmail_ServerValidate(object source, ServerValidateEventArgs args)
        {

            //Email Regex String
            Regex reg = new Regex(@"\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*");

            // Check if there is NO match in Regex
            if (!reg.IsMatch(yourEmail.Text))
            {
                //Does not match RegEx - Invalid email address

                yourEmail.CssClass = "error";
                args.IsValid = false;
            }
            else
            {
                yourEmail.CssClass = "";
                args.IsValid = true;
            }
        }

        #endregion

    }
}