ASP.NET

Problem on MessageBox

Please support our ASP.NET advertiser: $6.99 Domain Names at 1&1. Includes Free Privacy. Save Now!

•

Join Date: Sep 2007

Posts: 73

Reputation: ebabes is an unknown quantity at this point

Solved Threads: 0

ebabes

Offline

Junior Poster in Training

Problem on MessageBox

Feb 9th, 2008

I wish to display a MessageBox when a user had entered an invalid input in a textbox. How can I do this using C# as my script?

•

Join Date: Nov 2007

Posts: 2,650

Reputation: Jx_Man is a glorious beacon of light

Solved Threads: 249

Jx_Man

Offline

Posting Maven

Re: Problem on MessageBox

Feb 9th, 2008

 Help with Code Tags 
 asp Syntax (Toggle Plain Text) 
< %@ 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>
< %@ 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>

Never tried = Never Know
So, Please do something before post your thread.
* PM Asking will be ignored *

•

Join Date: Feb 2008

Posts: 30

Reputation: dilipv is an unknown quantity at this point

Solved Threads: 4

dilipv

Offline

Light Poster

Re: Problem on MessageBox

Feb 9th, 2008

•

Join Date: Sep 2007

Posts: 73

Reputation: ebabes is an unknown quantity at this point

Solved Threads: 0

ebabes

Offline

Junior Poster in Training

Re: Problem on MessageBox

Feb 10th, 2008

Thanks. But just a sort of clarification, let's say what if a user had entered an invalid age in a textbox. And then a messagebox will pop up with a message "Sorry, your age is not qualified!". How can I do this?

•

Join Date: Feb 2008

Posts: 30

Reputation: dilipv is an unknown quantity at this point

Solved Threads: 4

dilipv

Offline

Light Poster

Re: Problem on MessageBox

Feb 11th, 2008

hi ebabes,

if you use the dropdownlist and add the number in to it, then there is no question of user making the mistake and so no need to prompt too..

Visual Basic code

Private flag As Boolean

Private Sub MyTextChangedHandler(sender As System.Object, e As System.EventArgs)
' Check the flag to prevent code re-entry.
If flag = False Then
' Set the flag to True to prevent re-entry of the code below.
flag = True
' Determine if the text of the control is a number.
If IsNumeric(textBox1.Text) = False Then
' Display a message box and clear the contents if not a number.
MessageBox.Show("The text is not a valid number. Please re-enter")
' Clear the contents of the text box to allow re-entry.
textBox1.Clear()
End If
' Reset the flag so other TextChanged events are processed correctly.
flag = False
End If
End Sub

Hope this will help you out.

Thank you
Jitesh
.Net Consulting