public UserDTO AddUser(UserDTO u)
{
if (DoesUserExist(u.Email))
{
throw new UserAlreadyExistsException("EmailID Already Exist, Try another email.");
}
else if (DoesAadharExist(u.AadharNumber))
{
throw new UserAlreadyExistsException("Aadhar Number Already Exist.");
}
else
{
return(op.AddUpdateUser(u));
}
}