report builder expression

hello everyone -The user just happened to find a bug in my report. Here’s what happened : The below expression was written to handle cases when the end date is greater than start date. However, I don’t have the code to handle cases when end date is the same as start date. My question is, can I use the IIF statement in report expression in such a way:If end date > start date then Use my existing codeElse if end date = start date thenUse my new codeHow would I add the IIF statement to make it work?=Switch(First(Fields!Work_Center.Value, "DataSet1") = "AZ1", 16000 * (12 - left(Parameters!starttime.Value,1) + left(Parameters!endtime.Value,1) - 1),First(Fields!Work_Center.Value, "DataSet1") = "AZ2",18000 * (12 - left(Parameters!starttime.Value,1) + left(Parameters!endtime.Value,1) - 1),(First(Fields!Work_Center.Value, "DataSet1") = "GAV1" or First(Fields!Work_Center.Value, "DataSet1") = "GAV2"),8000 * (12 - left(Parameters!starttime.Value,1) + left(Parameters!endtime.Value,1) - 1),First(Fields!Work_Center.Value, "DataSet1") = "GAV3",10000 * (12 - left(Parameters!starttime.Value,1) + left(Parameters!endtime.Value,1) - 1),First(Fields!Work_Center.Value, "DataSet1") = "ZED",9600 * (12 - left(Parameters!starttime.Value,1) + left(Parameters!endtime.Value,1) - 1))Any help would be greatly appreciated.