ASP.NET - How to display javascript alert using C#?

Question

I have a page that contains a textbox and button, when the user clicks the submit button I want to display a message based on a bool value.

I have researched on stackoverflow and tried the code in this questions: Asp.net Webform Display Alert and redirect

But it didn't work. I have the following code:

ClientScript.RegisterStartupScript(this.GetType(),"", "alert('message')", true);

What code do I need to display the alert message?

Can you provide more information on what didn't work in the code from the question you referenced? — jeffa00
– jeffa00, Commented Feb 20, 2012 at 17:41
isn't that second parameter supposed to be the name of the updatepanel? maybe I'm thinking of another register script method... — Induster
– Induster, Commented Feb 22, 2012 at 7:38

enricoariel · Accepted Answer · 2012-02-20 17:37:22Z

8

you can use this simple method:

    private void MessageBox(string msg)
{
    Label lbl = new Label();
    lbl.Text = "<script language='javascript'>" + Environment.NewLine + "window.alert('" + msg + "')</script>";
    Page.Controls.Add(lbl);
}

answered Feb 20, 2012 at 17:37

enricoariel

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3 Comments

enricoariel Over a year ago

you are adding a script from code behind, I can't see any risk!

Bruce Over a year ago

Literal lit = new Literal(); is better I think, don't have to wrap a <span></span> in this case.

enricoariel Over a year ago

yes I agree with Bruce, Literal is a better choice, thank you.

Deepakmahajan · Accepted Answer · 2012-02-22 07:30:47Z

2

Use this apporch

 Response.Write(@"<script language='javascript'>alert('The following errors have occurred: \n" + strErrorDesc + " .');</script>");

answered Feb 22, 2012 at 7:30

Deepakmahajan

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1 Comment

Cullub Over a year ago

I get: MyPage.aspx: ASP.NET Runtime Error: Only Content controls are allowed in a page that contains Content controls.

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