Email verification in C# winforms

Samuel Toh

So for the Email, I want every user that register to have a @ in their Email. Otherwise, it will prompt out an error saying that Email is invalid.

For example, if the user enter "Johngmail.com" there will be an error because it doesnt have "@".

So the correct email would be "[email protected]".

4 Replies

Know the answer? Post it — somebody with the same question will find it here.

Vikas Panwar4y ago
Hi, You Can Use Like As
public int ValidateEmailId(string emailId)
   {

            System.Text.RegularExpressions.Regex rEMail = new System.Text.RegularExpressions.Regex(@"^[a-zA-Z][\w\.-]{2,28}[a-zA-Z0-9]@[a-zA-Z0-9][\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$");
            if (emailId.Length > 0)
            {
                if (!rEMail.IsMatch(emailId))
                {
                    return 0;
                }
                else
                {
                    return 1;
                }
            }
            return 2;
      }
Sachin Singh4y ago
.NET already have a mail class, which validates the mail format, like @ and dot(.), so directly use that.
create a class "common" anywhere in your project and copy paste below code
public class Common
{
public bool IsValidEmailAddress (string email)
{
    try
    {
        MailAddress ma = new MailAddress (email);

        return true;
    }
   catch
   {
        return false;
   }
}
}
now use this method, in your form
private void btnSendMail(eventArgs......)
{
Common com= new Common();
if(com.IsValidEmailAddress(txtEmail.Text))
{
// send Mail
}else
{
MessageBox.Show("Email is not valid");
}

}
Srinivasan Ramamoorthi4y ago
Use regular expression to validate.

Check this link

https://stackoverflow.com/questions/16167983/best-regular-expression-for-email-validation-in-c-sharp
Jignesh Kumar4y ago
Hi Samuel,

Please refer this forum, Its already answer in our forum group which will help you out,
https://www.c-sharpcorner.com/forums/how-to-validate-email-id-entered-in-windows-form-textbox