Using MessageBox C# - Throws Error

Question

I want to use MessageBox in C#

using System.Windows.Forms;

MessageBox.Show("Some text", "Some title",MessageBoxButtons.OK, MessageBoxIcon.Error);

Still I got this error. How to fix it?

The MessageBox does not exist in current context.

You are trying to use in asp.net, webforms? it could not be used there. — Adil
– Adil, Commented Mar 13, 2017 at 6:42

Community · Accepted Answer · 2017-05-23 11:53:49Z

5

You can not use MessageBox within asp.net, try using Javascript confirm instead. Here is its usage confirmation yes or no message in asp net or you can use it for some other problems too.

edited May 23, 2017 at 11:53

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answered Mar 13, 2017 at 6:42

M. Adeel Khalid

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Comments

Vijunav Vastivch · Accepted Answer · 2017-03-13 07:47:20Z

2

Asp.net doesn't support MessageBox.. You can use this instead of MessageBox.

ScriptManager.RegisterStartupScript(this, this.GetType(), "popup", "alert('" + Your Message here + "');", true);

to use this:

String str = "This is your message.";
ScriptManager.RegisterStartupScript(this, this.GetType(), "popup", "alert('" + str  + "');", true);

This way:

private void show(string message)
{
    System.Web.UI.Page page = this.Page;
    ScriptManager.RegisterStartupScript(page, page.GetType(), "popup", "alert('" + message + "');", true);
}

To use this:

 show("this is your message");

edited Mar 13, 2017 at 7:47

answered Mar 13, 2017 at 6:43

Vijunav Vastivch

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9 Comments

EnzoZow Over a year ago

I used this line. but "this" syntax throws error. What word should I replace to it?

EnzoZow Over a year ago

Throws the same error. I put the codes at may method, XXXXX.aspx.cs. Is there any conflict?

Vijunav Vastivch Over a year ago

no problem about that.. what error? do you have this above? using System.Web; using System.Web.UI; using System.Web.UI.WebControls;

EnzoZow Over a year ago

Keyword 'this' is not valid in a static property, static method, or static field initializer

Vijunav Vastivch Over a year ago

You are using static procedure i think. You can try it in form_load first to test if working.

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