Try this.
Regex nm = new Regex(@"[a-z A-Z]{2,120}");
if (!nm.IsMatch(textBox2.Text))
{
Message Box.Show("Enter Your Name Correctly ", "Error");
}
OR
Regex nm = new Regex(@"[a-z A-Z]{2,120}");
if (nm.Matches(textBox2.Text).Count == 0)
{
Message Box.Show("Enter Your Name Correctly ", "Error");
}
Please
vote and
Accept Answer if it Helped.