Easy way to check if a value is in an enum?

Hi,

I am trying to check if an int returned by the browser representing a user's account type is a valid value, ie. it is one of the values within an enumeration of valid account types.

Is there a quicker way of doing it than this

private bool InputIsWithinRange(ref int accountType)
{
Type accountTypeEnum_Type = typeof(SiteUser.AccountTypeEnum);

Array possibleValues = Enum.GetValues(accountTypeEnum_Type);

bool validAccountType = false;

for (int i = 0; i < possibleValues.Length; i++)
{
if (accountType == (int)possibleValues.GetValue(i))
{
validAccountType = true;
break;
}
}
return validAccountType;
}

Thanks!

Carlos