string nm = ((Label)GridView1.Rows[e.RowIndex].FindControl("lblname")).Text;
        string Bo = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txnbno")).Text;
        //string BNo = Convert.ToInt32(Bo)
        string bdate = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtbildate")).Text;
        string adre = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtadrsse")).Text;
        string phn = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtphnebin")).Text;
        string emil = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtemidl")).Text;
        string supfr = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtsupfor")).Text;
        string bbd = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtbnd")).Text;
 SqlConnection con = new SqlConnection(strConnString);
        SqlCommand cmd = new SqlCommand();
        cmd.CommandType = CommandType.Text;
 cmd.CommandText = "update suplerrate set BillNo=@BillNo," + "BillDate=@BillDate," + "Address=@Address, " + " Phone=@Phone ," + " EmailId=@EmailId," + "Supplierfor=@Supplierfor," + "Brand=@Brand   where Name=@Name;" +
       "select  Name, BillNo,BillDate, Address,Phone,EmailId,Supplierfor,Brand from suplerrate";
        //  "select  Name, BillNo,BillDate, Address,Phone,EmailId,Supplierfor,Brand,Billingrate,vat,discount,total,percentage,amount from suplerrate";
        cmd.Parameters.Add("@Name", SqlDbType.VarChar).Value = nm;
        cmd.Parameters.Add("@BillNo", SqlDbType.Int).Value = BNo;
        cmd.Parameters.Add("@BillDate", SqlDbType.VarChar).Value = bdate;
        cmd.Parameters.Add("@Address", SqlDbType.VarChar).Value = adre;
        cmd.Parameters.Add("@Phone", SqlDbType.BigInt).Value = phn;
        cmd.Parameters.Add("@EmailId", SqlDbType.VarChar).Value = emil;
        cmd.Parameters.Add("@Supplierfor", SqlDbType.VarChar).Value = supfr;
        cmd.Parameters.Add("@Brand", SqlDbType.VarChar).Value = bbd;
GridView1.EditIndex = -1;
        GridView1.DataSource = GetData(cmd);
        GridView1.DataBind();
 
 
 
 my source code is
 <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" 
                    Font-Names = "Arial" Font-Size = "11pt" BackColor="White" 
                    AlternatingRowStyle-BackColor = "#C2D69B" HeaderStyle-BackColor = "pink" 
                    ShowFooter="true" onrowediting="EditCustomer" 
                    onrowcancelingedit="CancelEdit" 
                    onrowupdating="UpdateCustomer">
            <Columns>
            <asp:TemplateField HeaderText="Name"  ItemStyle-Width = "5px">
            <ItemTemplate>
                <asp:Label ID="lblname" runat="server" Text="<%#bind('Name') %>"></asp:Label>
            </ItemTemplate>
            <FooterTemplate>
                <asp:TextBox ID="txbna" runat="server"></asp:TextBox>
            </FooterTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="BillNo">
            <ItemTemplate>
                <asp:Label ID="lblbillno" runat="server" Text="<%# bind('BillNo') %>"></asp:Label>
            </ItemTemplate>
            <FooterTemplate>
                <asp:TextBox ID="txnbno" runat="server"></asp:TextBox>
            </FooterTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="BillDate">
            <ItemTemplate>
                <asp:Label ID="lbldatebil" runat="server" Text="<%#bind('BillDate' )%>"></asp:Label>
            </ItemTemplate>
            <FooterTemplate>
                <asp:TextBox ID="txtbildate" runat="server"></asp:TextBox>
            </FooterTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="Address">
            <ItemTemplate>
                <asp:Label ID="lblladrss" runat="server" Text="<%#bind('Address') %>"></asp:Label>
            </ItemTemplate>
            <FooterTemplate>
                <asp:TextBox ID="txtadrsse" runat="server"></asp:TextBox>
            </FooterTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="Phone">
            <ItemTemplate>
                <asp:Label ID="lblbinpho" runat="server" Text="<%#bind('Phone') %>"></asp:Label>
            </ItemTemplate>
            <FooterTemplate>
                <asp:TextBox ID="txtphnebin" runat="server"></asp:TextBox>
            </FooterTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="EmailId">
            <ItemTemplate>
                <asp:Label ID="lblemiid" runat="server" Text="<%#bind('EmailId') %>"></asp:Label>
            </ItemTemplate>            
            <FooterTemplate>
                <asp:TextBox ID="txtemidl" runat="server"></asp:TextBox>
            </FooterTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="Supplierfor">
            <ItemTemplate>
                <asp:Label ID="lblsuplerfor" runat="server" Text="<%#bind('Supplierfor') %>"></asp:Label>
            </ItemTemplate>
            <FooterTemplate>
                <asp:TextBox ID="txtsupfor" runat="server"></asp:TextBox>
            </FooterTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="Brand">
            <ItemTemplate>
                <asp:Label ID="lblbrdn" runat="server" Text="<%#bind('Brand') %>"></asp:Label>
            </ItemTemplate>
            <FooterTemplate>
                <asp:TextBox ID="txtbnd" runat="server"></asp:TextBox>
            </FooterTemplate>
            </asp:TemplateField>
          <%--  <asp:TemplateField HeaderText="Billingrate">
            <ItemTemplate>
                <asp:Label ID="lbbigent" runat="server" Text="<%#bind('Billingrate') %>"></asp:Label>
            </ItemTemplate>
            <FooterTemplate>
                <asp:TextBox ID="txtbingnnt" runat="server"></asp:TextBox>
            </FooterTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="vat">
            <ItemTemplate>
                <asp:Label ID="lbvvat" runat="server" Text="<%#bind('vat') %>"></asp:Label>
            </ItemTemplate>
            <FooterTemplate>
                <asp:TextBox ID="txvaatb" runat="server"></asp:TextBox>
            </FooterTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="discount">
            <ItemTemplate>
                <asp:Label ID="lbdisun" runat="server" Text="<%#bind('discount') %>"></asp:Label>
            </ItemTemplate>
            <FooterTemplate>
                <asp:TextBox ID="txtdiscnt" runat="server"></asp:TextBox>
            </FooterTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="total">
            <ItemTemplate>
                <asp:Label ID="lbtolot" runat="server" Text="<%#bind('total') %>"></asp:Label>
            </ItemTemplate>
            <FooterTemplate>
                <asp:TextBox ID="txttoool" runat="server"></asp:TextBox>
            </FooterTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="percentage">
            <ItemTemplate>
                <asp:Label ID="lblpercng" runat="server" Text="<%#bind('percentage') %>"></asp:Label>
            </ItemTemplate>
            <FooterTemplate>
                <asp:TextBox ID="txtpecntge" runat="server"></asp:TextBox>
            </FooterTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="amount">
            <ItemTemplate>
                <asp:Label ID="lbamt" runat="server" Text="<%#bind('amount') %>"></asp:Label> 
            </ItemTemplate>
            <FooterTemplate>
                <asp:TextBox ID="txtamnut" runat="server"></asp:TextBox>
            </FooterTemplate>
            </asp:TemplateField>
          --%>  <asp:TemplateField>
               <ItemTemplate>
                   <asp:LinkButton ID="lnkRemove" runat="server"  CommandArgument = '<%# Eval("Name")%>'   OnClientClick = "return confirm('Do you want to delete?')"
                Text = "Delete"   OnClick = "DeleteCustomer"> </asp:LinkButton>
                   </ItemTemplate>
                    <FooterTemplate>
        <asp:Button ID="btnAdd" runat="server" Text="Add"  OnClick = "AddNewCustomer" />
    </FooterTemplate>
            </asp:TemplateField>
            <asp:CommandField  ShowEditButton="True" />
            </Columns><AlternatingRowStyle BackColor="#C2D69B"  />
            </asp:GridView>
  
 
 
my error is 
 
 
 Server Error in '/bramandam site' Application.
Compilation Error
Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately. 
Compiler Error Message: CS0103: The name 'BNo' does not exist in the current context
Source Error:|  | 
| Line 421:        //  "select  Name, BillNo,BillDate, Address,Phone,EmailId,Supplierfor,Brand,Billingrate,vat,discount,total,percentage,amount from suplerrate"; Line 422:        cmd.Parameters.Add("@Name", SqlDbType.VarChar).Value = nm; Line 423:        cmd.Parameters.Add("@BillNo", SqlDbType.Int).Value = BNo; Line 424:        cmd.Parameters.Add("@BillDate", SqlDbType.VarChar).Value = bdate; Line 425:        cmd.Parameters.Add("@Address", SqlDbType.VarChar).Value = adre; | 
Source File: d:\bramandam site\stockentry.aspx.cs    
Line: 423 
Show Detailed Compiler Output:
Show Complete Compilation Source:
Version Information: Microsoft .NET Framework Version:2.0.50727.4984; ASP.NET Version:2.0.50727.4971