Forms Data Controls :: Transfer The Image From Gridview To Excel Sheet

This is the class file im using to export the datagrid to excel sheet. Problem is i cant able to transfer the image from gridview to excel sheet using this code. What are the modifications i can do for the below code to export the image.

public class ExcelReport
{
# region Export to excel
/// <summary>
/// Function for Export html report to Excel sheet
/// </summary>
/// <param name="fileName">File name</param>
/// <param name="gv">Gridview</param>
///
public void ExportToExcel(string fileName, GridView gv)
{
try
{
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.AddHeader("content-disposition", string.Format("attachment; filename={0}", fileName));
HttpContext.Current.Response.ContentType = "application/ms-excel";
using (StringWriter sw = new StringWriter())
{
using (HtmlTextWriter htw = new HtmlTextWriter(sw))
{
Table table = new Table();
if (gv.HeaderRow != null)
{
//gv.HeaderRow.CssClass = "GridviewStyle";
// gv.HeaderRow.Font.Bold = true;
PrepareControlForExport(gv.HeaderRow);
table.Rows.Add(gv.HeaderRow);
}......................................