Open Ajax ModalPopUPExtender if TextBoxes values are not equal using C# and VB.Net in ASP.Net

Hi iammann,

Check this example. Now please take its reference and correct your code.

HTML

<div>
    <asp:ScriptManager runat="server" />
    <asp:TextBox ID="TextBox1" runat="server" />
    <asp:TextBox ID="TextBox2" runat="server" />
    <asp:LinkButton ID="lnkDummy" runat="server"></asp:LinkButton>
    <asp:Button ID="btnAgreedAmountSubmit" runat="server" Text="Agreed Amount Submit"
        OnClick="AgreedAmountSubmit"></asp:Button>
    <cc1:ModalPopupExtender ID="mpe" runat="server" PopupControlID="pnlPopup" TargetControlID="lnkDummy"
        OkControlID="btnYes" CancelControlID="btnNo" BackgroundCssClass="modalBackground">
    </cc1:ModalPopupExtender>
    <asp:Panel ID="pnlPopup" runat="server" CssClass="modalPopup" Style="display: none">
        <div class="header">
            Confirmation
        </div>
        <div class="body">
            Sum of service area split not matched with client fee.<br />
            Are you agree to submit ?
        </div>
        <div class="footer" align="right">
            <asp:Button ID="btnYes" runat="server" Text="Yes" />
            <asp:Button ID="btnNo" runat="server" Text="No" />
        </div>
    </asp:Panel>
</div>

Code

C#

protected void AgreedAmountSubmit(object sender, EventArgs e)
{
    if (TextBox1.Text != TextBox2.Text)
    {
        mpe.Show();
    }
}

VB.Net

Protected Sub AgreedAmountSubmit(ByVal sender As Object, ByVal e As EventArgs)
    If TextBox1.Text <> TextBox2.Text Then
        mpe.Show()
    End If
End Sub