Give own column name in Export in excel from sql

 StringWriter sw = new StringWriter();
            HtmlTextWriter htw = new HtmlTextWriter(sw);
            Response.ClearContent();
            Response.Charset = "";

            htw.Write("<table border=2><b><tr><td align=center>Name</td><td>Mobile No.</td><td>Alternate No.</td><td align=center>Email</td><td>Date of Birth</td><td>Gender</td><td>Marital Status</td><td align=center>Spouse Name</td><td>Spouse Mobile</td><td>Spouse Alternate No.</td><td>Spouse Date of Birth</td><td align=center>Residential Address</td><td align=center>Official Address</td><td>Car</td><td>Car Brand</td><td>Car No.</td><td align=center>Father Name</td><td>Father Mobile No.</td><td>Father Date of Birth</td><td align=center>Mother Name</td><td>Mother Mobile No.</td><td>Mother Date of Birth</td><td align=center>Brother Name</td><td>Brother Mobile No.</td><td>Brother Date of Birth</td><td align=center>Sister Name</td><td>Sister Mobile No.</td><td>Sister Date of Birth</td><td>Credit Card No.</td align=center><td>Delivery Address</td><td>Anniversary Date</td><td>No. of Child</td><td>Child Name</td><td>Child Mobile no.</td><td align=center>Child School</td><td>Child Name</td><td>Child Mobile no.</td><td align=center>Child School</td><td>Child Name</td><td>Child Mobile no.</td><td align=center>Child School</td><td>Child Name</td><td>Child Mobile no.</td><td align=center>Child School</td><td>Child Name</td><td>Child Mobile no.</td><td align=center>Child School</td><td>Date</td><td>Ticket No.</td><td>Temprorary</td><td>Temprorary</td><td>Temprorary</td></tr></b></table>");


            Response.ClearContent();
            Response.Charset = "";
            Response.AddHeader("content-disposition", "attachment; filename=Squarekart_log.xls");
            Response.ContentType = "application/vnd.ms-excel";
            GridView gridExcel = new GridView();
             gridExcel.ShowHeader = false;         // hide header comes from sql

            gridExcel.RowStyle.Font.Size = FontUnit.Point(9);
            gridExcel.AlternatingRowStyle.Font.Size = FontUnit.Point(9);
            gridExcel.AlternatingRowStyle.ForeColor = System.Drawing.Color.FromName("Black");
            gridExcel.AlternatingRowStyle.BackColor = System.Drawing.Color.FromName("White");
            gridExcel.RowStyle.BackColor = System.Drawing.Color.FromName("White");
            gridExcel.RowStyle.ForeColor = System.Drawing.Color.FromName("Black");
            gridExcel.HeaderStyle.Font.Bold = true;
            gridExcel.AllowPaging = false;
            gridExcel.AllowSorting = false;
            gridExcel.GridLines = GridLines.Both;

            gridExcel.DataSource = dobj.search_dashboard(txtfrom.Text, txtto.Text, txtmob.Text, txtname.Text);
            gridExcel.DataBind();
            //StringWriter sw = new StringWriter();
            //HtmlTextWriter htw = new HtmlTextWriter(sw);
            gridExcel.RenderControl(htw);
            Response.Write(sw.ToString());
            Response.End();