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Editorial Team
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Asked: 2026-05-24T09:09:34+00:00

I am trying to display some text using MessageBox.Show as shown below in a

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I am trying to display some text using MessageBox.Show as shown below in a page_load event in ASP.NET. Before anyone jumps on the case why I am using it in ASP.NET, the use is for debugging only on my own dev box for a special need. There’s a reference to System.Windows.Forms in the app.

I used it a few years ago so I know WinForm’s MessageBox works. I am using .NET 4.0 and VS 2010. I don’t think anything related to this function has changed.

MessageBox.Show("Message", "Caption", MessageBoxButtons.OK, MessageBoxIcon.Information, MessageBoxDefaultButton.Button1, MessageBoxOptions.DefaultDesktopOnly); //used also ServiceNotification option

Any ideas why the message box doesn’t display? I have only that line in the code.

ADDITION:

I am VERY AWARE of the message box thing implications. It’s a temporary thing for debugging only. The line won’t go into production. I have no access to javascript. Please put your thought into why it doesn’t work instead of why I shouldn’t be using it. I have used it before in 2.0 and it does work. I want to know if the newer .NET changed anything or I misused the option.

Direct Answer: it works in Visual Studio’s web server , not in IIS.

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1 Answer

  1. Editorial Team

    The web application is hosted in a process that does not have a desktop, so you cant see any messageboxes.

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