Export GridView with DropDownList to Excel using ASP.Net

Hello,

I have nested grid and i want to send the grid record into an Excel file to the client. I an export grid and save in excel file on the server. And then send this file to the client.   My page contain 2 drop down bind runtime. When I complete the export the report and save in excel file and then click on drop down it get blank. What is the problem. I am using the method for render control in html.

public override void VerifyRenderingInServerForm(Control control)
        {
 
        }