[Solved] Displaying error message “Email not valid” but still saving to database file

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Because all of your code is outside of your if block. So it’s going to execute every time, regardless of the condition.

Put the code in the if block:

Regex regMail = new Regex(@"^\w+@[a-zA-Z_]+?\.[a-zA-Z]{2,3}$");

if (regMail.IsMatch(mailID.Text))
{
    Email email = new Email();

    string emailAdd = mailID.Text;
    string phone =    phoneBox.Text;
    string messageEmail = email.Text;

    System.IO.StreamWriter file = new System.IO.StreamWriter(@"D:\Lia\mail.txt", true);
    file.WriteLine(emailAdd + phone + messageEmail);

    file.Close();
}
else
{
    MessageBox.Show("Invalid Email ID, Please enter \nvalid Email ID.");
}

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solved Displaying error message “Email not valid” but still saving to database file