How to write the Code in Single Update button in clude Edit button Code(Only show the Update Button only not show in Edit Button) in outside gridview Plz correct the code

protected void btnUpdae_Click(object sender, EventArgs e)
        {
       
          
            SqlDataAdapter daq;
            string connection = System.Configuration.ConfigurationManager.ConnectionStrings["MyDB"].ConnectionString;
            using (SqlConnection con = new SqlConnection(connection))
            {
                con.Open();
                daq = new SqlDataAdapter("update TextAnswers set Comments='" + grdView.Rows[1].Cells[5].Controls[0] + "', Marks=" + grdView.Rows[1].Cells[5].Controls[0] + " where Emp_ID=" + grdView.Rows[1].Cells[5].Controls[0] + "UserName='" + Request.QueryString["UserName"] + "'", con);
                SqlCommandBuilder sb = new SqlCommandBuilder(daq);
                sb.ConflictOption = ConflictOption.OverwriteChanges;

                daq.RowUpdated += new SqlRowUpdatedEventHandler(daq_RowUpdated);

                sb.ConflictOption = ConflictOption.CompareAllSearchableValues;

 
            }

          
        }