Possible reasons for not being able to see a control from the codebehind?

I am looking at a Main.Master with a single <asp:Content> control and inside that some ASP.NET login stuff (LoginView, LoginName, etc).

I tried adding a Label like so:

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<asp:LoginName ID="LoginName1" runat="server" FormatString="Welcome {0} <br />" />
<asp:Label ID="Label1" runat="server" />

but it doesn't show in the codebehind.

Any obvious reason for this?

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Sometimes the Visual Studio Designer gets out of sync and does not generate the Designer code files correctly. These are some methods I've found helpful:

• Switch between HTML view and Design view.
• Make sure the project is compiled.
• Try to remove and reinsert the new control.
• Open and close the aspx file.

I haven't really found a pattern yet on when exactly Visual Studio fails to add new controls correctly to the .designer.cs/vb file, but a random combination of the stuff metioned above usually helped.

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Check to see if you have a line like this in your Main.master.designer.cs file (assuming you use C#)

protected global::System.Web.UI.WebControls.Label Label1;

if not - add it.

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If your label is inside a LoginView then as a LoginView is a container you need to do LoginView1.FindControl("Label1") and then cast it a Label.

VB:

Dim label1 as Label = CType(LoginView1.FindControl("Label1"),Label)

C#:

Label label1 = (Label)LoginView1.FindControl("Label1")