Question

I am editing a field in gridview and would like that the edited value not be allowed to be greater than the old value?

is there a front end validation for this? so as to not use a javascript popup

Thanks

<asp:TemplateField HeaderText="FC Amount">             
    <ItemTemplate>   
        <asp:Label ID="FCLabel" runat="server" Text='<%# Eval("FC AMOUNT") %>'></asp:Label>         
    </ItemTemplate>
    <EditItemTemplate>                    
        <asp:TextBox ID="FCTextBox1" runat="server" Text='<%# Eval("FC AMOUNT") %>'></asp:TextBox>
    </EditItemTemplate>
</asp:TemplateField> 

Answer 1

Use the CompareValidator control:

Add hidden with old value, and compare its value with new one. Or set ValueToCompare property:

<asp:TemplateField HeaderText="FC Amount">             
    <ItemTemplate>   
        <asp:Label ID="FCLabel" runat="server" Text='<%# Eval("FC AMOUNT") %>'></asp:Label>         
    </ItemTemplate>
    <EditItemTemplate>                    
        <asp:TextBox ID="FCTextBox1" runat="server" Text='<%# Eval("FC AMOUNT") %>'></asp:TextBox>
        <asp:CompareValidator 
    ID="cmpAmount" 
    runat="server" 
    ValueToCompare='<%# Eval("FC AMOUNT") %>'
    ControlToValidate="FCTextBox1"
    Type="Double"
    Operator="LessThanEqual" /> 

    </EditItemTemplate>
</asp:TemplateField>

How to: Validate Against a Specific Value for ASP.NET Server Controls
CompareValidator.Operator Property