<ASP:TextBox id="txtEmail" runat="server">           

<asp:RequiredFieldValidator 

ControlToValidate="txtEmail"                           

Text="Enter Your Email Address!"              

Runat="Server" />

 

I have found out that the above input validation doesn't work in older version of Netscape. As you know, some older browsers will not work with JavaScript. How do I get the input validation above in ASP.Net to work with all browsers including very old versions?

 

If txtEmail.Trim() = String.Empty Then

Response.Write("<script>alert('Please enter an email address');</script.")

Exit Sub

End If

 

but if it's an email address don't you want to use a regular expressions validator to check its a valid email AND is not null?

 

I finally solved my problem. I am just curious. Which do you prefer to use for input validation in ASP.Net: JavaScript or RequiredFieldValidator? I really like the way Required Expressions Validator works with email addresses. I wish that there was a way to force an user to re-enter the email address if it didn't exist. I have had several people who entered wrong email addresses in one of my forms before. It was really frustrating because I had to call them to find out the correct email address.

 

Here's the code that I put under Page Load:

 

If Page.IsPostBack = True Then

 

  'Check that all of the validation controls 
 'on this page indicate valid input
If Page.IsValid Then

'Add the data as a new record in the database 
Call AddValuesToDatabase()
      
Call AddValuesToEmail()

'Display the results "page" 
Call DisplayResults()

End If

End If

 

 

But to stop people entering the wrong email address why don't you send them an automated email to the address they entered with a verification code or something.