I have created a dynamic table using string builder and data from sql and each row consists of a button and i have to show that row data in ajax

protected void Button1_Click(object sender, EventArgs e)
    {

        StringBuilder st = new StringBuilder();
        st.AppendLine("<table>");
        st.AppendLine("<tr>");
        st.AppendLine("</tr>");


        con.Open();
        string sqlQuery = "spread ";
        SqlCommand cmd = new SqlCommand(sqlQuery, con);
        cmd.CommandType = CommandType.StoredProcedure;
        SqlDataReader sdr = cmd.ExecuteReader();
        DataTable dt = new DataTable();

        if (sdr.HasRows)
        {
            sdr.Read();
            dt.Load(sdr);
            int i = 0;
            foreach (DataColumn dc in dt.Columns)
            {
                i++;

                st.AppendLine("<tr><td>");
                st.AppendLine("" + dc.ToString());


                st.AppendLine("</td></tr>");


            }
            st.AppendLine("");
           
            foreach (DataRow dr in dt.Rows)
            {
                st.AppendLine("<tr>");
                int k = 0;
                do
                {
                    st.AppendLine("<td>");

                   // On this dynamic button i have to fetch the data of the particular row in ajax modalpopupextender
                    st.AppendLine("<input type=submit id= " + k + dr[k].ToString() + " name=" + k + dr[k].ToString() + "  runat="server"  value=" + dr[k].ToString() );


                    st.AppendLine("</td>");



                    k++;
                } while (k < dt.Columns.Count);
                st.AppendLine("</tr>");
            }
           
        }
        st.AppendLine("</table>");
        Literal1.Text = st.ToString();
    }