C# Calling by Reference!
Calling by reference is used so that a variable passed to a method WILL be altered within the method and retrieved as modified. 
Code to Call Method:
 string strExceptionMessage_LoadDdlb_Status = string.Empty;
if (LoadDdlb_Status(ref strExceptionMessage_LoadDdlb_Status)) 
Called Method:
public bool LoadDdlb_Status(ref string strParm_ExceptionMessage_LoadDdlb_Status) 
    The "ref" keyword is required both by the caller and the method called.  strExceptionMessage_LoadDdlb_Status will contain the value as modified by the method LoadDdlb_Status.