How can i export specific columns in gridview instead of exporting the whole gridview?

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C#3.0

C#

ASP.NET

Hi! all
How can i export specific columns in gridview instead of exporting the whole gridview.
Following is the normal code i've written which works fine, but i want to export some limited number of columns.
Please help me out

Following is my code which works fine:

Response.Clear();
Response.AddHeader("content-disposition", "attachment;filename=Untitled.xls");
Response.Charset = "";
// If you want the option to open the Excel file without saving then
// comment out the line below
// Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.ContentType = "application/vnd.xls";
System.IO.StringWriter stringWriter = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter htmlWriter = new HtmlTextWriter(stringWriter);
worklistGridView.RenderControl(htmlWriter);
Response.Write(stringWriter.ToString());
Response.End();