Exception Details: System.web.HttpException: control 'Header1_txtbox1' of type 'TextBox' must be Placed inside a form tag with runat= server.
When you Creating the Asp.net Controls you need to add in form tag.
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When you Creating the Asp.net Controls you need to add in form tag.
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<form runat="server">
<asp:textbox id="txtboxId"
runat="server"
width="130px"></asp:textbox>
</form>
