public ReportOutputParametersViewModel(string dateType,
                                        DateTime from,
                                        DateTime to,
                                        string textFieldType,
                                        string operatorType, string searchText, CheckBoxCollectionViewModel outputColumns)
 {
     DateType      = dateType;
     FromDate      = from;
     ToDate        = to;
     TextFieldType = textFieldType;
     OperatorType  = operatorType;
     SearchText    = searchText;
     ReportColumns = outputColumns;
 }
 public ReportOutputParametersViewModel()
 {
     ReportColumns = new CheckBoxCollectionViewModel();
 }