Invoking a pop-up 'confirm' message box in ASP.NET

I know how to this when a button is clicked. For example:

imgBtnDelete.Attributes.Add("onclick", "return confirm('Please confirm you want to delete the letter')")

My question is:

Say I have a piece of code-behind not related to clicking,calculating the value of a boolean, and if the boolean开发者_C百科 is true then I want the message box with ok/cancel to appear.

f.e.:

bool hasMoney = ...

if (hasMoney)
{
\\message box..
}

How do I do it?

---

You can do something like this:

private void OpenConfirmPrompt()
{
    string strScript = "<script language=JavaScript>alert('File Uploaded');</script>";

    if (!ClientScript.IsStartupScriptRegistered("open"))
    {
        ClientScript.RegisterStartupScript(typeof(Page), "open", strScript);
    }
}

And change the JS there to suit.

So call that function from a server side event.

Edit, much better explanation than me here

---

Why not use the Ajax Control Toolkit's ConfirmButton extender? Then rather than writing the JavaScript yourself, you can just set the Enabled property in your code-behind e.g.

<asp:Button runat="server" ID="MyButton" Text="My Button" />
<ajaxtoolkit:ConfirmButtonExtender runat="server" id="MyButtonConfirmExtender" TargetControlID="MyButton" ConfirmText="Continue?" />

and

if (whatever)
{
    MyButtonConfirmExtender.Enabled = true;
}