Compare TextBoxes in TemplateField of GridView in ASP.Net

I have created a sample for you. You can make use of Compare Validator

    <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false">
        <Columns>
            <asp:TemplateField>
                <ItemTemplate>
                    <asp:TextBox ID="txtRate1" runat="server" Text = '<%# Eval("Rate1") %>'></asp:TextBox>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField>
                <ItemTemplate>
                    <asp:TextBox ID="txtRate2" runat="server" Text = '<%# Eval("Rate2") %>'></asp:TextBox>
                </ItemTemplate>
            </asp:TemplateField>
             <asp:TemplateField>
                <ItemTemplate>
                    <asp:CompareValidator ID="CompareValidator1" runat="server" Operator = "LessThan" ErrorMessage="Rate1 should be less than Rate2" ControlToValidate = "txtRate1" ControlToCompare = "txtRate2"></asp:CompareValidator>
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>
    <asp:Button ID="Button1" runat="server" Text="Update" />

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            DataTable dt = new DataTable();
            dt.Columns.AddRange(new DataColumn[2] { new DataColumn("Rate1"), new DataColumn("Rate2") });
            dt.Rows.Add(12, 25);
            dt.Rows.Add(34, 29);
            dt.Rows.Add(10, 11);
            dt.Rows.Add(45, 14);
            GridView1.DataSource = dt;
            GridView1.DataBind();
}
}