I have a User Control (myUserControl.ascx) with the code:

<div id="content"> 

that is called from a webpart:

protected override void OnLoad(EventArgs e) {
 Control c = Page.LoadControl(_ascxPath);
   if (c != null)

since here it's all ok.

Now I want to add a code-behind to this User Control

1) I created myUserControl.ascx.cs

public partial class SP4ITeditXML : UserControl

 public string select1 = "test text";

2) I changed the myUserControl.ascx:

<%@ Control Language="C#" CodeBehind="myUserControl.ascx.cs"%>
<div id="content"> 
 <% Response.Write(this.select1);  %>

but then I get the error CS0117 (myUserControl.ascx not contains a definition for select1).

What I'm doing wrong?

  • 2
    When you add the USer Control from the "Add" menu, selecting User Control from the Visual Studio templates, it should create both the ASCX and the ASCX.CS files for you... – James Love Aug 24 '11 at 10:00
  • @James Love, wow, that's true. The problem was that I create the class manually, but creating from the Add menu, Visual Studio add the code properly. If you want to write it like a answer instead a comment, I'll accept it – user674887 Aug 25 '11 at 7:31

Commented migrated to answer:

Add the User Control via the templates, do Project -> Add -> New Item -> User Control.

This creates the ASCX and the associated CS file.

  1. Compile the myUserControl.ascx.cs to a signed assembly.
  2. Reference the myUserControl.ascx.cs with the full qualified name in the myUserControl.ascx
  3. Add the assembly to the GAC.
  • 2
    Again, if you use the VS2010 templates properly, you shouldn't need to do any manual steps. – James Love Aug 24 '11 at 10:05

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