show data in outside textbox from selected row in gridview

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C#

ASP.NET

I having a grid view.

<asp:GridView ID="grdPurchaseBill" runat="server" CssClass="grdcls grdstyle" ShowHeader="true" AutoGenerateColumns="false" ShowFooter="true" AllowSorting="true" ShowHeaderWhenEmpty="true" EmptyDataText="No Records Found">
<Columns>
 <asp:CommandField ShowDeleteButton="True" ButtonType="Link" DeleteImageUrl="~/Images/trash.png" FooterStyle-BorderStyle="None" ItemStyle-BorderStyle="None" HeaderText="Action"> </asp:CommandField>
</asp:CommandField>
<asp:BoundField DataField="AcctId" HeaderText="Accout ID" />
<asp:BoundField DataField="CreditToAccount" />
<asp:BoundField DataField="Amount" HeaderText="Amount" />
<asp:BoundField DataField="Vat" HeaderText="VAT%" />
<asp:BoundField DataField="BasicAmount" HeaderText="Basic Amt." />
</Columns>
</asp:GridView>

and cs code is:

protected void grdPurchaseBill_RowCommand(object sender, GridViewCommandEventArgs e)
        {
            try
            {
                int index = Convert.ToInt32(e.CommandName.ToString());
                string accidno = grdPurchaseBill.Rows[index].Cells[2].Text.ToString();
                txtCreditToAcc.Text = accidno;
                txtamount.Text = grdPurchaseBill.Rows[index].Cells[3].Text.ToString();
                txtVat.Text = grdPurchaseBill.Rows[index].Cells[4].Text.ToString();
                txtBasicAmount.Text = grdPurchaseBill.Rows[index].Cells[5].Text.ToString();
            }
            catch (Exception ex)
            {
            }
        }

when i click on grid row the row command has fire and i seen the values are assign to textbox(using break point). but when i seen on page the textbox are empty. i tired from this. plz help
Thanks