Control ctl00 of type 'GridView' must be placed inside a form tag with runat=server

CodeSnip: Exporting GridView to Excel: ASP Alliance

This is pretty confusing, since your GridView is already inside the form tags and also contains the runat = server attribute. You can easily resolve this error by adding the following lines.

Listing 3: Overiding VerifyRenderingInServerForm Method
public override void VerifyRenderingInServerForm(Control control)
{
/* Confirms that an HtmlForm control is rendered for the specified ASP.NET
server control at run time. */
}


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