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| ArcObjects Help for .NET developers > ArcObjects namespaces > Catalog > ESRI.ArcGIS.Catalog > Interfaces > IQ > IQuery Interface (ArcObjects .NET 10.5 SDK) | 
Provides access to members that let you modify a query.
| Description | ||
|---|---|---|
|  | AddFieldQuery | Adds a field query. | 
|  | ClassID | Class ID indicating the type of query object that has been defined. | 
|  | DatasetName | Name of the dataset for which to search. | 
|  | DatasetType | Type of object for which to search. | 
|  | Date1 | Start date, or first date. | 
|  | Date2 | End date, or second date. | 
|  | DateOperator | Operator for comparing dates. | 
|  | DateType | Date that will be tested. | 
|  | EngineProperties | Property set containing properties of the search engine that will be used to execute the query. | 
|  | Envelope | Search extent in decimal degrees. | 
|  | EnvelopeOperator | Operator for comparing the dataset's extent to the search extent. | 
|  | GetFieldQuery | Returns the nth field query. | 
|  | IsCaseSensitive | Indicates if field query comparisons will be case sensitive. | 
|  | Load | Loads the query's parameters from the given XML property set. | 
|  | NameOfQuery | Name of the query. | 
|  | NativeEnvelope | Search extent in the dataset's coordinate system. | 
|  | NumFieldQueries | Number of field queries. | 
|  | Save | Saves the query's parameters to the given XML property set. | 
| CoClasses and Classes | Description | 
|---|---|
| FileSystemQuery (esriCatalogUI) | A query that can be used to search XML documents. |