private string GetErrorIfInvalid(User user, bool shouldCheckUsername)
{
var error = string.Empty;
if (string.IsNullOrWhiteSpace(user.UserName))
{
error = "user name cant be empty or null";
}
if (shouldCheckUsername && _userBl.IsUserExist(user.UserName))
{
error = "user name already exist";
}
if (user.Gender.ToString().Length < 1)
{
error = "Please Select Gender";
}
return(error);
}