How to display MessageBox in ASP.NET web application?

1.  Create a class and add these two methods to it :

2.   

3.  // for postback events

4.  public static void ShowMessageBox(string _message)

5.      {

6.          Page page = HttpContext.Current.Handler as Page;

7.          page.RegisterStartupScript("key2", "");

8.      }

9.   

10.// for async postback events

11. public static void ShowMessageBoxForAsync(string _message)

12.    {

13.        Page page = HttpContext.Current.Handler as Page;

14.        ScriptManager.RegisterClientScriptBlock(page,page.GetType(), "key2", "alert('" + _message + "');", true);

15.    }

16. 

17.// Then you can call this in, let's say , button_click event handler like this ( i assume that your class name is Utilities without any namespace definition) :

18.protected void myButton_Click(object sender, EventArgs e)

19.{

20.Utilities.ShowMessageBox("you entered a wrong password");

21.}

Thanks for reply sir its working but again i have a problem to validate only characters i.e. if any digit will be entered then a textbox must show the messagebox.I tried this like the following  but it could not working.Please sir send me the code for character validation.Its hurry for me.

Say u have created a text box txtcphone and it doesnt allow user to enter character. Use the java script function as
follows and call it in pagebehind:

.aspx page:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ContactUs.aspx.cs" Inherits="Contents_ContactUs" %>

<%@ Register Src="../UserControls/Bottom1.ascx" TagName="Bottom" TagPrefix="uc2" %>
<%@ Register Src="../UserControls/Top1.ascx" TagName="Top" TagPrefix="uc1" %>
http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
http://www.w3.org/1999/xhtml">

   
   


   

       
          
                                                   
                                                   
                                                       
                                                                  
                                                                   
                                                                   
                                                               
                                                           

*                                                                             Phone:

MaxLength="20" align="left">

                                                       
                                                   
   

 

.cs:

 

 protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {

          
            txtCphone.Attributes.Add("OnKeyPress", "return ValidatePhoneNo(this)");
           
           

        }
       

    }