how can i downlaod data which show in gridview?

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C#

ASP.NET

Hello friends,

i want to downlaod the data which show in my gridview can any one guide me??

 string attachment = "attachment; filename=rates.xls";
Response.ClearContent();
Response.AddHeader("content-disposition", attachment);
Response.ContentType = "application/ms-excel";
StringWriter stw = new StringWriter();
HtmlTextWriter htextw = new HtmlTextWriter(stw);
GridView1.RenderControl(htextw);
Response.Write(stw.ToString());
Response.End();  

i am using this code for download button but this code download only the current page means we have 3 page in gridview this code download only that page which is show on gridview. help me friends