Gridview Excel Export In C#

1. void             BindGrid()  
2. {  
3.   
4.  DataSet objds = "";  
5.            GridView1.DataSource = objds;  
6.             GridView1.DataBind();  
7. }  
8.   
9. void ExcelExport  
10. {  
11.             Response.ClearContent();  
12.             Response.Buffer = true;  
13.             Response.AddHeader("content-disposition", string.Format("attachment; filename={0}", "UserDetails.xls"));  
14.             Response.ContentType = "application/ms-excel";  
15.             StringWriter sw = new StringWriter();  
16.             HtmlTextWriter htw = new HtmlTextWriter(sw);  
17.             gvAdminDetails.AllowPaging = false;  
18.             BindGrid();  
19.             //Change the Header Row back to white color  
20.             Gridview1.HeaderRow.Style.Add("background-color", "#FFFFFF");  
21.               
22.             //Applying stlye to gridview header cells  
23.             for (int i = 0; i < gvAdminDetails.HeaderRow.Cells.Count; i++)  
24.             {  
25.                Gridview1.HeaderRow.Cells[i].Style.Add("background-color", "#F0F0F0");  
26.             }  
27.             int j = 1;  
28.             //This loop is used to apply stlye to cells based on particular row  
29.             foreach (GridViewRow gvrow in gvAdminDetails.Rows)  
30.             {  
31.                 gvrow.BackColor = System.Drawing.Color.White;  
32.                 if (j <= Gridview1.Rows.Count)  
33.                 {  
34.                     if (j % 2 != 0)  
35.                     {  
36.                         for (int k = 0; k < gvrow.Cells.Count; k++)  
37.                         {  
38.                             gvrow.Cells[k].Style.Add("background-color", "#F0F0F0");  
39.                         }  
40.                     }  
41.                 }  
42.                 j++;  
43.             }  
44.   
45.            Gridview1.RenderControl(htw);  
46.             Response.Write(sw.ToString());  
47.              
48.            Gridview1.AllowPaging = true;  
49.             Response.End();  
50. }  
51.   
52.    
53. public override void VerifyRenderingInServerForm(Control control)  
54.     {  
55.         //required to avoid the runtime error "  
56.       //Control 'GridView1' of type 'GridView' must be placed inside a form tag with runat=server."  
57.     }