// Checking the values that come from textbox
private bool FormValidation()
{
bool hasError = false;
bool success = int.TryParse(TxtPhoneNumber.Text, out _);
if (string.IsNullOrEmpty(TxtEmail.Text) || string.IsNullOrEmpty(TxtPassword.Text) || string.IsNullOrEmpty(TxtName.Text) || string.IsNullOrEmpty(TxtSurname.Text) || string.IsNullOrEmpty(TxtPhoneNumber.Text))
{
MessageBox.Show("Zəhmət olmasa bütün xanaları doldurun");
hasError = true;
}
else if (!Regex.IsMatch(TxtEmail.Text, @"^[a-zA-Z][\w\.-]*[a-zA-Z0-9]@[a-zA-Z0-9][\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$"))
{
MessageBox.Show("E-poçt ünvani düzgün yazın");
TxtEmail.Select(0, TxtEmail.Text.Length);
TxtEmail.Focus();
hasError = true;
}
else if (!success)
{
MessageBox.Show("Nömrəni düzgün daxil edin");
TxtPhoneNumber.Select(0, TxtPhoneNumber.Text.Length);
TxtPhoneNumber.Focus();
hasError = true;
}
return(hasError);
}
