private void tbAltEmail_TextChanged(object sender, EventArgs e) { String emailValue = this.tbEmail.Text; flag = ValidateInsertValue.checkEmail(emailValue); if (flag == true) { lbAltEmailvalidate.Text = "Correct"; hasError = false; } else { if (this.tbEmail.Text != "") { lbAltEmailvalidate.Text = "Invalid Email"; } else { lbAltEmailvalidate.Text = ""; } hasError = true; } }