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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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6 Answers

up vote 8 down vote accepted

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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What is myStringVariable?? – Aditya Nawandar Mar 23 at 5:11
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myStringVariable is just a string. It would be set to the message you wish to display. – Gage Mar 25 at 20:02
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There are several options to create a client-side messagebox in ASP.NET - see here, here and here for example...

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Right click the solution explorer and choose the add reference.one dialog box will be appear. On that select (.net)-> System.windows.form. Imports System.Windows.Forms (vb) and using System.windows.forms(C#) copy this in your coding and then write messagebox.show("").

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up vote 1 down vote

not really. Server side code is happening on the server--- you can use javascript to display something to the user on the client side, but it obviously will only execute on the client side. This is the nature of a client server web technology. You're basically disconnected from the server when you get your response.

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Why should not use jquery popup for this purpose.I use bpopup for this purpose.See more about this.
http://dinbror.dk/bpopup/

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up vote 1 down vote

There are a few solutions; if you are comfortable with CSS, here's a very flexible solution:

Create an appropriately styled Panel that resembles a "Message Box", put a Label in it and set its Visible property to false. Then whenever the user needs to see a message after a postback (e.g. pushing a button), from codebehind set the Labels Text property to the desired error message and set the Panel's Visible property to true.

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