Web Forms :: Exclude Textbox Control From VerifyRenderingInServerForm?

How do I stop a TEXTBOX from rending on user click?

I have a gridview, a button, a textbox (for searching string) on my web page. When the button is clicked the data is exported from the gridview to MS EXCEL. I am having issues with the following code. It execute the export to MS Excel when the user click the enter key.

NOTE: My application works fine except for when the user clicks the enter key on the keyboard the export seems to be triggered. I do not want that to happen on enter.

CODE:

Public Overloads Overrides Sub VerifyRenderingInServerForm(ByVal control As Control)
'Confirms that an HtmlForm control is rendered for the specified ASP.NET server control at run time.
End Sub

GOAL: How do I specify only the Gridview control to be rendered, when the above function is called.
Only gridview control when the button is click. No other user activity should execute the the MS Excel export. I would like to exclude textbox control from VerifyRenderingInServerForm?