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Editorial Team
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Asked: 2026-06-15T15:34:11+00:00

In asp.net I am using the label field in which I am keeping ID

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In asp.net I am using the label field in which I am keeping ID and AssociatedControlID same then its not throwing any exception

   <asp:Label ID="Username" runat="server" AssociatedControlID="Username">Username:</asp:Label>

But when I am using ID and AssociatedControlID differently then I am getting an exception

  <asp:Label ID="lblUsername" runat="server" AssociatedControlID="Username">Username:</asp:Label>

the exception I am getting is

Unable to find control with id ‘Username’ that is associated with the Label ‘lblUsername’

What might be the reason?

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1 Answer

  1. Editorial Team

    Usually you associate a label to another control like a TextBox.

    <asp:Label ID="myLabel" runat="server" AssociatedControlID="myTextBox">Username:</asp:Label>
<asp:TextBox runat="server" ID="myTextBox"></asp:TextBox>

    Since you try to associate it to some control with id Username in the second example I can guess that you don’t have another control with id Username. That is why you’re getting the exception.

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