MessageBox in C# showing error

Question

I was attempting to add MessageBox.Show(Message); and it was not found in my C# .net web application (button click method and also in Page_Load).An error showing like

'The name 'MessageBox' does not exist in the current context'

Do I need to add any assembly reference for this? (I am using .net framework 4). Is there any alternative method for this?

Community · Accepted Answer · 2017-05-23 10:26:39Z

5

The key words in your description are

web application

This functionality is only available in client (WinForms, WPF) based applications, not ASP.NET. To do this in a web app you will need to use Javascript, as illustrated in this previous Stack Overflow question.

edited May 23, 2017 at 10:26

CommunityBot

11 silver badge

answered Apr 1, 2013 at 10:47

slugster

50k14 gold badges105 silver badges150 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Sharique Hussain Ansari · Accepted Answer · 2013-04-01 10:58:49Z

3

Use This:

System.Web.UI.ScriptManager.RegisterStartupScript(this, typeof(Page), "alert", "alert('" + Message + "')", true);

Hope This help.

answered Apr 1, 2013 at 10:58

Sharique Hussain Ansari

1,4561 gold badge12 silver badges22 bronze badges

Comments

Hossein Narimani Rad · Accepted Answer · 2013-04-01 11:07:03Z

3

System.Windows.MessageBox is used in WPF applications and System.Windows.Forms.MessageBox is used in Windows Form applications but your project is WebApplication so you don't have access to any of them.

edited Apr 1, 2013 at 11:07

answered Apr 1, 2013 at 10:52

Hossein Narimani Rad

32.7k19 gold badges92 silver badges121 bronze badges

2 Comments

Newton Sheikh Over a year ago

really!!! all you need to do is add the reference of System.windows.Forms in the project and MessageBox.Show() will work. Try it in any Asp.net application. But I am not sure what will happen after deploying in IIS and then using from non MS-OS

Hossein Narimani Rad Over a year ago

@NewtonSheikh for more clarification you may have a look at other answers for this post.

Sachin · Accepted Answer · 2013-04-01 10:48:13Z

2

The MessageBox class in the System.Windows.Forms namespace is usable from Windows Forms and Not ASP.NET Web Forms.

answered Apr 1, 2013 at 10:48

Sachin

41.1k7 gold badges94 silver badges107 bronze badges

Collectives™ on Stack Overflow

MessageBox in C# showing error

4 Answers 4

Comments

Comments

2 Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

4 Answers 4

Comments

Comments

2 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related