Gridview column image is not exported to excel in C#

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ASP.NET

C#3.5

I have image in one column of grid view along with some value. When I tried to export it in excel all goes well except image is not exported. It shows blank image icon in that column with value. Tried below code for this. I want image in that column. plz help.In worst case plz suggest how I can remove that blank image icon from that column. As it has value with image I can't simply delete that column

What I have tried:

public static void MultitbleDataset2SingleSheetGridExport(GridView[] gv, String filename)
   {
       string Filename = filename + ".xls";
       //if (ds == null || ds.Tables.Count == 0)
       //{
       //    throw new ArgumentException("DataSet needs to have at least one DataTable", "dataset");
       //}
       HttpResponse Response = System.Web.HttpContext.Current.Response;
       Response.Clear();
       Response.Buffer = true;
       Response.ClearContent();
       Response.AddHeader("content-disposition", "attachment;filename=" + Filename);
       Response.Cache.SetCacheability(HttpCacheability.NoCache);
       Response.ContentType = "application/ms-excel";
       StringWriter sw = new StringWriter();
       HtmlTextWriter htw = new HtmlTextWriter(sw);

       Table tb = new Table();
       for (int i = 0; i < gv.Length; i++)
       {
           GridView gridvw = new GridView();
           // string grid = ConvertDataTableToHTML(ds.Tables[i]);
           //gridvw.DataSource = gv[i];
           //gridvw.DataBind();
          PrepareForExport(gv[i]);

           TableRow tr1 = new TableRow();
           TableCell cell1 = new TableCell();
           cell1.Controls.Add(gv[i]);
           tr1.Cells.Add(cell1);
           TableCell cell2 = new TableCell();
           cell2.Text = "&nbsp;";
           TableRow tr2 = new TableRow();
           tr2.Cells.Add(cell2);
           TableRow tr3 = new TableRow();
           tb.Rows.Add(tr1);
           tb.Rows.Add(tr2);
           tb.Rows.Add(tr3);

       }
       tb.RenderControl(htw);

       //style to format numbers to string
       string style = @"<style> .textmode { mso-number-format:\@; } </style>";
       Response.Write(style);
       Response.Output.Write(sw.ToString());
       Response.Flush();
       Response.End();
   }

   public static void PrepareForExport(GridView Gridview)
   {

         Gridview.DataBind();

       //Change the Header Row back to white color
       Gridview.HeaderRow.Style.Add("background-color", "#FFFFFF");

       //Apply style to Individual Cells
       for (int k = 0; k < Gridview.HeaderRow.Cells.Count; k++)
       {
           Gridview.HeaderRow.Cells[k].Style.Add("background-color", "#436F9F");
       }

       for (int i = 0; i < Gridview.Rows.Count; i++)
       {
           GridViewRow row = Gridview.Rows[i];

           //Change Color back to white
           row.BackColor = System.Drawing.Color.White;
           row.Attributes.Add("class", "textmode");
           row.Attributes.Remove("image");
           //Apply style to Individual Cells of Alternating Row
           if (i % 2 != 0)
           {
               for (int j = 0; j < Gridview.Rows[i].Cells.Count; j++)
               {
                   row.Cells[j].Style.Add("background-color", "#C2D69B");
               }
           }
       }
   }