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Editorial Team
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Asked: 2026-05-31T14:05:20+00:00

In an asp.net windows forms application, in the C# code behind you can use:

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In an asp.net windows forms application, in the C# code behind you can use: 

MessageBox.Show("Here is my message");

Is there any equivalent in a asp.net web application?
Can I call something from the C# code behind that will display a message box to the user?

Example usage of this: I have a button that loads a file in the code behind. When the file is loaded or if there is an error I would like to popup a message to the user stating the result.

Any ideas on this?

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1 Answer

  1. Editorial Team

    You want to use an Alert. Unfortunately it’s not as nice as with windows forms.

    ClientScript.RegisterStartupScript(this.GetType(), "myalert", "alert('" + myStringVariable + "');", true);

    Similar to this question here: http://forums.asp.net/t/1461308.aspx/1

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