Dear All

I have a problem

I create a user control

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="TestUmbracoUserControll.ascx.cs" Inherits="TestUmbracoUserControll" %>
<asp:Label ID="Label1" runat="server" Text="Chao ban"></asp:Label><br />
<asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />

the code

public partial class TestUmbracoUserControll : System.Web.UI.UserControl
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        Label1.Text = "chao gi a";
    }
}

After that i deploy and code *.dll into  bin folder and *.ascx to the usercontrol folder of installed umbraco

+Put the *.dll in bin folder into the bin folder of the installed umbraco.

+Put the .ascx file into the usercontrols folder of the isntalled umbraco

Create a macro  and browser to the ascx file

Use the macro in the master page

<umbraco:Macro ID="Macro5" Alias="MyTestMacro"  runat="server"></umbraco:Macro>

Server Error in '/' Application.
Control 'ContentPlaceHolderDefault_BIDCContactForm_3_Button1' of type 'Button' must be placed inside a form tag with runat=server.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.HttpException: Control 'ContentPlaceHolderDefault_BIDCContactForm_3_Button1' of type 'Button' must be placed inside a form tag with runat=server.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[HttpException (0x80004005): Control 'ContentPlaceHolderDefault_BIDCContactForm_3_Button1' of type 'Button' must be placed inside a form tag with runat=server.]
   System.Web.UI.Page.VerifyRenderingInServerForm(Control control) +8910280
  ....
.... 
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1 

please help me

thank you for your patience