Gridview Editing

protected void btnShow_Click(object sender, EventArgs e)

    {

        GridItemCollection objGridSelectedItems = grdPartyTypeMaster.SelectedItems;

        GridItem grdItem = objGridSelectedItems[0];

      

             txtPartyType.Text = grdItem.Cells[2].Text.ToString();

             Session["OUTLET_TP"] = txtPartyType.Text;

             txtPartyType.ReadOnly = true;

             txtDescription.Text = grdItem.Cells[3].Text.ToString();

             ComRateType.SelectedValue = grdItem.Cells[4].Text.ToString();

             cmbGLCode.SelectedValue = grdItem.Cells[5].Text.ToString();

             cmbGrpCode.SelectedValue = grdItem.Cells[6].Text.ToString();            

             comComm.SelectedValue = grdItem.Cells[7].Text.ToString();

             comPro.SelectedValue = grdItem.Cells[8].Text.ToString();

          }