With ASP.NET, how do I prompt the user for a yes/no question and getting the result back to my .ascx?

So far I can open a confirmation dialog with use of Javascript, but I can't return the value. But I don't know if this is the right approach.

With ASP.NET, how do I prompt the user for a yes/no question and getting the result back to my .ascx?

So far I can open a confirmation dialog with use of Javascript, but I can't return the value. But I don't know if this is the right approach.

• c#
• javascript
• asp

• C# doesn't have a message box like in windows forms C#. That's why the javascript message boxes are used – Ruben Commented May 3, 2011 at 9:34
• 1 asp doesn't have, to be more precise. – Sergey Metlov Commented May 3, 2011 at 15:01

8 Answers 8

You can use standart JavaScript confirm() function to show popup and do Post Back in case of Yes or No. For example:

if (confirm('Question')) {
    __doPostBack('', 'Yes_clicked');
} else {
    __doPostBack('', 'No_clicked')
}  

Then on server in Page_Load() method do:

if (IsPostBack)
{
    var result = Request.Params["__EVENTARGUMENT"];
}

You can also do it async by specifying the first parameter of __doPostBack() function as ID of any update panel.

This is not a good practice to do this. you can get your confirm using javascript and postback or callback result to server.

but if you want to do this, this will help you :

A Simple ASP.NET Server Control: Message Box & Confirmation Box

add this in head of source

call it like this

If you insist on using webforms, another solution could be the AJAX Control kit. Simply create a ModalPopup and have you confirm buttons inside that.

Read more here: http://www.asp/ajax/ajaxcontroltoolkit/Samples/ModalPopup/ModalPopup.aspx

You need to use ajax, or to make a postback to the server. Your c# code is server side and the javascript is client side. If you use the ajax extensions for asp you can use javascript page methods:

PageMethods.YourMethod(confirm('your text'), OnSuccess, OnFailure);

I use this. As far as I know it prevents the rest of the button event from executing.

btnMyButton.Attributes.Add("onClick", "return confirm('Are you really sure?')");

Another option is to show yes/no:

<script>     
        function AlertFunction() {
            if (confirm('Are you sure you want to save this thing into the database?')) {
               $('#ConfirmMessageResponse').val('Yes');
            } else {
                $('#ConfirmMessageResponse').val('No');
            }
        }
    </script>

to handle it from side:

string confirmValue = ConfirmMessageResponse.Value;
                if (confirmValue == "Yes")
                {...}

string confirmValue = ConfirmMessageResponse.Value; showing error in this line when using in side