public string FileImport(string FileName, string CallType) { if (CallType == "User") { return(_businessInstance.UserFileImport(FileName, CallType)); } if (CallType == "Fleet") { return(_businessInstance.FleetFileImport(FileName, CallType)); } if (CallType == "Order") { return(_orderBusinessInstance.OrderFileImport(FileName, CallType)); } return("Incorrect Call Type!"); }