personal project questions

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how to create other forms as childs for the mdi form??
how to validate email id and what is it's regular expression??
i have following code but showing error

C#

Regex regex = new Regex("^(a-z)$");
            if (regex.IsMatch(textBox11.Text))
            {
                errorProvider3.SetError(textBox1, String.Empty);
            }
            else
            {
                errorProvider3.SetError(textBox1,
                      "Only email id is allow here");
            }

Posted 3-Sep-13 8:23am

cserakeshcseranjan

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Boipelo 3-Sep-13 14:35pm

All questions were answered this week, browse the section. I will also try to get links for you...

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Mike Meinz · Answer 1 · 2013-09-03T08:30:00

Whether you use a regular expression or the .NET Framework example, please remember that both check only the format of an email address.
They do not ascertain if the email address actually exists in a mailbox server.

C# Example

C#

public static bool isValidEmail(string inputEmail)
{
   string strRegex = @"^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}" +
         @"\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\" +
         @".)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$";
   Regex re = new Regex(strRegex);
   if (re.IsMatch(inputEmail))
    return (true);
   else
    return (false);
}

An article on email address format validation using a Regular Expression
How to Find or Validate an Email Address[^]

.NET Framework Example
This example uses the .NET MailAddress Class to validate the format of an email address.

C#

bool IsValidEmail(string email)
{
    try {
        var mail = new System.Net.Mail.MailAddress(email);
        return true;
    }
    catch {
        return false;
    }
}