Execute condition based on Yes No confirm dialog selection using C# and VB.Net in ASP.Net

Hi KurtJ,

Use AjaxControlToolkit ModalPopupExtender.

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

HTML

<asp:TextBox runat="server" ID="txtCondition1" Text="false" />
<asp:TextBox runat="server" ID="txtCondition2" Text="true" />
<asp:Button Text="Save" runat="server" OnClick="ButtonSave_Click" />
<cc1:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
</cc1:ToolkitScriptManager>
<asp:LinkButton ID="lnkDummy" runat="server"></asp:LinkButton>
<cc1:ModalPopupExtender ID="ModalPopupExtender1" BehaviorID="mpe" runat="server"
    PopupControlID="pnlPopup" TargetControlID="lnkDummy" BackgroundCssClass="modalBackground"
    CancelControlID="btnNo">
</cc1:ModalPopupExtender>
<asp:Panel ID="pnlPopup" runat="server" CssClass="modalPopup" Style="display: none">
    <div class="header">
    </div>
    <div class="body">
        <asp:Label ID="lblMessage" runat="server" />
        <br />
    </div>
    <div class="footer">
        <asp:Button ID="btnYes" runat="server" Text="Yes" OnClick="OnYes" />
        <asp:Button ID="btnNo" runat="server" Text="No" />
    </div>
</asp:Panel>

Code

C#

public void ButtonSave_Click(object sender, EventArgs e)
{
    lblMessage.Text = "";
    bool Condition1 = Convert.ToBoolean(txtCondition1.Text);
    bool Condition2 = Convert.ToBoolean(txtCondition2.Text);
    if (Condition1 == false)
    {
        // Show confirm box "Accept condition 1?"
        lblMessage.Text = "Accept condition 1?";
        ModalPopupExtender1.Show();
    }
    if (Condition2 == false)
    {
        // Show confirm box "Accept Condition 2?"
        lblMessage.Text = "Accept condition 2?";
        ModalPopupExtender1.Show();
    }
}

public void OnYes(object sender, EventArgs e)
{
    // Do saving procedure
    ClientScript.RegisterClientScriptBlock(this.GetType(), "", "alert('Record saved successfully')", true);
}

VB.Net

Public Sub ButtonSave_Click(ByVal sender As Object, ByVal e As EventArgs)
    lblMessage.Text = ""
    Dim Condition1 As Boolean = Convert.ToBoolean(txtCondition1.Text)
    Dim Condition2 As Boolean = Convert.ToBoolean(txtCondition2.Text)

    If Condition1 = False Then
        ' Show confirm box "Accept condition 1?"
        lblMessage.Text = "Accept condition 1?"
        ModalPopupExtender1.Show()
    End If

    If Condition2 = False Then
        ' Show confirm box "Accept condition 2?"
        lblMessage.Text = "Accept condition 2?"
        ModalPopupExtender1.Show()
    End If
End Sub

Public Sub OnYes(ByVal sender As Object, ByVal e As EventArgs)
    ' Do saving procedure
    ClientScript.RegisterClientScriptBlock(Me.GetType(), "", "alert('Record saved successfully')", True)
End Sub

Screenshot