Gridview to MS office or Excel

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C#

ASP.NET

Dear sir
Gridview to or Excel is working fine. I am using the code Mr.Nandakishorerao. it's really working fine but there was a mistake when exporting data gridview to excel below i noted the error.

Actual name:REKHA MEHTA
Given result in excel:REKHA MEHTA

Please give me the solution.
I am using following code

private void excelexport()
    {
        Response.Clear(); 
        Response.Buffer = true;
        Response.AddHeader("content-disposition", "attachment;filename=GridViewExport.csv"); 
        Response.Charset = ""; 
        Response.ContentType = "application/text";
        gridviewsta.AllowPaging = false;
        gridviewsta.DataBind(); 
        StringBuilder sb = new StringBuilder();
        for (int k = 0; k < gridviewsta.Columns.Count; k++) 
        { //add separator 
            sb.Append(gridviewsta.Columns[k].HeaderText + ',');
        } //append new line 
        sb.Append("\r\n");
        for (int i = 0; i < gridviewsta.Rows.Count; i++)
        {
            for (int k = 0; k < gridviewsta.Columns.Count; k++) 
                { //add separator 
                    sb.Append(gridviewsta.Rows[i].Cells[k].Text + ','); } //append new line 
                    sb.Append("\r\n"); 
                } 
        Response.Output.Write(sb.ToString()); 
        Response.Flush(); 
        Response.End();
    }