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How to export grid view in excel having nested grid view ? this is giving erroe given below...

Error giving while exporting in excel : Control 'GridView2' of type 'GridView' must be placed inside a form tag with runat=server.

Put this in your page's code
public override void VerifyRenderingInServerForm(Control control)
   /* Verifies that the control is rendered */

I strongly suspect this is the issue. If this don't solve the issue,let me know.

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As mentioned in error description, issue is with your FORM tag. You have to specify runat="server" with FORM tag. Like below:

<form id="form1" runat="server">

Post your code(aspx & cs) if this does not solve your issue.
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That doesn't nearly a question though. We can't see your code so that we can tell what that error mean.Better follow these links and find solution:
Export Nested GridView data to excel in[^]
Export Nested Gridview to Excel[^]
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