Hi Don,

When does this error occur ? Do you have a code example ?

Dave

Hello Dave,

The error came from inside the "simple.ascx.cs" sbmt_click event. The error message came from catch:

           try
            {

                var returnUrl = LegacyDialogHandler.Create(
                    new HttpContextWrapper(Context),
                    new User(Security.CurrentUser),
                    Request.GetItemAsString("nodeType"),
                        nodeId,
                        rename.Text.Trim(),
                        Request.QueryString.AsEnumerable().ToDictionary(x => x.Key, x => (object)x.Value));

                BasePage.Current.ClientTools
                .ChangeContentFrameUrl(returnUrl)
                .ReloadActionNode(false, true)
                .CloseModalWindow();
            }
            catch (Exception ex)
            {
                CustomValidation.ErrorMessage = "* " + ex.Message;
                CustomValidation.IsValid = false;
            }
        }

because I have a new task defined "SchoolProgramTasks.cs":

  public override bool PerformSave()
    {

        var checkingSchoolProgram = cms.businesslogic.schoolprogram.SchoolProgram.GetByAlias(Alias);
    }

And my businesslogic "SchoolProgram.cs":

  public static SchoolProgram GetByAlias(string alias)
        {
            return ApplicationContext.Current.ApplicationCache.RuntimeCache.GetCacheItem<SchoolProgram>(
                GetCacheKey(alias),
                timeout: TimeSpan.FromMinutes(30),
                getCacheItem: () =>
                {
                    var schoolprogram = ApplicationContext.Current.Services.SchoolProgramService.GetByAlias(alias);
                    if (schoolprogram == null) return null;
                    return new SchoolProgram(schoolprogram);
                });
        }

I traced the error to inside "DeepCloneRuntimeCacheProvider.cs" and the "GetCacheItem" call. There, I got object reference error.

I wonder if that is because of permission issues. The school program is a node under a new application I created. I have another node under "settings" application and that seems to work.

Thank you for your help, -Don

Hi Don,

A couple of more questions :

• What version of Umbraco are you using ?
• Where are you using this simple.ascx
• What is ApplicationContext.Current.Services.SchoolProgramService ?

In general I would like to to know what your goal is.

Dave

Hello Dave,

I have added a new application "School", and in the application, I want users to create new programs. I have a similar feature working under "Settings". I think the difference is that "Settings" is an out of box features, and my school application application is customization.

To answer your question:

1) I run version 7.4.1 2) I defined a new task SchoolProgramTasks.aspx, and the task create action is defined in the UI.xml that calls the simple.ascx

Best, -Don

Hi Don,

I see you are using .NET user controls and webforms for building your custom application in the backend.

Since Umbraco 7 the backend is built with Angular and it is also preferred that you extend it that way.

I did a talk at 2014 Umbraco UK fest on building custom applications in Umbraco using Angular. Most of the concepts still apply.

You can see the source code of the talk here : https://bitbucket.org/dawoe/umbukfestival2014

And the video of the talk on Youtube : https://www.youtube.com/watch?v=_sX9eZSn9HI

I also just found these video's on Youtube, but haven't watched them my self : https://www.youtube.com/watch?v=NY0OXGaCWVU&list=PLIJFrS8cNs2DagJaLFMTZn8oO11EbmL

And if it's data in database tables you want to edit maybe this package can help you speed up the development : https://our.umbraco.org/projects/developer-tools/ui-o-matic/

Dave

Thank you Dave for the info. I will look at them.

Right now, I just need to get it to work as I am short on time.

Best, -Don

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