///<summary>Attemmpts to get a referral.
///Returns null and shows a MsgBox if there was an error.</summary>
public static Referral GetReferral(long referralNum, bool isMsgShown = true)
{
Referral referral;
if (!Referrals.TryGetReferral(referralNum, out referral) && isMsgShown) //Failed to retrieve referral
{
ShowReferralErrorMsg();
}
return(referral);
}
