c# string handling

i have a comma delimited string being returned from a function.
i can console.writeline the string out... but i just cant seem to get the .SPLIT string function to work.

the Split function won't create the array.

code:

                        Ret_CHASSIS = GetChassisbyRFID(Ret_RFID);
                       Console.WriteLine("return Ret_CHASSIS ************ - " + Ret_CHASSIS);
                       char[] commaSeparator = new char[] { ',' };
                       string[] EQCast = new string[3];
                     
                       EQCast = Ret_CHASSIS.Split(commaSeparator);
                     
                       for (int i = 0; i < EQCast.Length; i++)
                       {
                           Console.WriteLine("*****", EQCast[i]);
                       }