ASP.Net: Bootstrap Modal Popup Ok Cancel Confirm example using C# and VB.Net

Hi ramco1917,

Please refer below updated code.

HTML

<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.0.3/css/bootstrap.min.css" media="screen" />
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.0.3/js/bootstrap.min.js"></script>
<div class="modal-dialog">
    <div class="modal-content">
        <div class="modal-header">
            <h5 class="modal-title"><b>Confirmation</b></h5>
            <button type="button" class="bootbox-close-button close" data-dismiss="modal" aria-hidden="true">×</button>
        </div>
        <div class="modal-body">
            <div class="bootbox-body">
                <div class="bootbox-form">
                    <!-- Dynamic content can be placed here if needed -->
                    <asp:Label ID="ltrlDelHead" Text="Are You Sure, You want to Delete This?" runat="server"></asp:Label>
                </div>
            </div>
        </div>
        <div class="modal-footer">
            <asp:LinkButton ID="lnkCancel" CssClass="btn bg-danger" runat="server"
                OnClick="lnkRecordDelete_Click" CommandArgument="Cancel">Cancel</asp:LinkButton>
            <asp:LinkButton ID="lnkRecordDelete" CssClass="btn bg-danger" runat="server"
                OnClick="lnkRecordDelete_Click" CommandArgument="Delete">Delete</asp:LinkButton>
        </div>
    </div>
</div>

Code

C#

protected void lnkRecordDelete_Click(object sender, EventArgs e)
{
    string commandArgument = (sender as LinkButton).CommandArgument.ToLower();
    if(commandArgument == "cancel")
    {
        ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "alert", "alert('Cancel button clicked.');", true);
    }
    else if (commandArgument == "delete")
    {
        ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "alert", "alert('Delete button clicked.');", true);
    }
}

VB.Net

Protected Sub lnkRecordDelete_Click(ByVal sender As Object, ByVal e As EventArgs)
    Dim commandArgument As String = TryCast(sender, LinkButton).CommandArgument.ToLower()
    If commandArgument = "cancel" Then
        ScriptManager.RegisterClientScriptBlock(Me, Me.GetType(), "alert", "alert('Cancel button clicked.');", True)
    ElseIf commandArgument = "delete" Then
        ScriptManager.RegisterClientScriptBlock(Me, Me.GetType(), "alert", "alert('Delete button clicked.');", True)
    End If
End Sub

Screenshot