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Show Alert Box using ASP.NET


Posted Date:     Category: .NET Framework    
Author: Member Level: Gold    Points: 4

This article demonstrates how to display a client side messagebox using ASP.NET webforms and javascript.


 


We can show alert message using asp.net. For that we have to register a ClientScriptBlock and invoke this option.

Sample Code 


< %@ Page Language="C#" %> 
< script runat="server">  
   void AlertBtn_Click(object sender, EventArgs e) 
   { 
       string showmessage = "Test Message Box"; 
       string alertScript = "< script language=JavaScript> "; 
       alertScript += "alert('" +showmessage +"');"; 
       alertScript += "< /script" +"> "; 

       if (!IsClientScriptBlockRegistered("alert")) 
           this.RegisterClientScriptBlock("alert", alertScript); 
   } 
< /script>  
< html>  
< head>  
< /head>  
< body>  
   < form runat="server">  
       < asp:Button id="btn" onclick="AlertBtn_Click" 
 runat="server" Text="Button"> < /asp:Button>  
   < /form>  
< /body> 
< /html>



In the sample we can see the alert message on Click of "btn"- button click.





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Responses to "Show Alert Box using ASP.NET"
Author: Alwin Durairaj    06 Jul 2004Member Level: Bronze   Points : 0
Hi I tried ur logic, but it does not work well.

Whenever i execute this code it diplays the script language in browsers window. Instead of displaying message box.

Could u help me to display the message box using ur logic.

I have attached my html part and code behind given below

aspx file

<%@ Page language="c#" Codebehind="WebForm1.aspx.cs" AutoEventWireup="false" Inherits="my_web_al2.WebForm1" %>





WebForm1













code behind file

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace my_web_al2
{
///
/// Summary description for WebForm1.
///
public class WebForm1 : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Button Button1;

private void Page_Load(object sender, System.EventArgs e)
{
// Put user code to initialize the page here
}



#region Web Form Designer generated code
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: This call is required by the ASP.NET Web Form Designer.
//
InitializeComponent();
base.OnInit(e);
}

///
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
///
private void InitializeComponent()
{
this.Load += new System.EventHandler(this.Page_Load);

}
#endregion
}
}


Hope u do ur best as soon as possible.
with good cheers,
Alwin



Author: Siddarth Tamagond    14 Apr 2005Member Level: Bronze   Points : 0
Hi Alwin Durairaj,
The code is correct , It will work fine, if u just remove the space while opening the tags and closing the tags, or just copy & paste the below code, I removed it.

<%@ Page Language="C#" %>


(14 Apr 2005)


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