> For the complete documentation index, see [llms.txt](https://pinvokeisalive.gitbook.io/pinvoke/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://pinvokeisalive.gitbook.io/pinvoke/directory/structures/filterregion.md).

# FILTERREGION

### C# Definition:

```cs
struct FILTERREGION {
   public int idChunk;
   public int cwcStart;
   public int cwcExtent;
}
```

### VB Definition:

```cs
'''  <summary>
  '''   The FILTERREGION structure describes the position and extent
  '''   of a specified portion of text within an object. This 
  '''   structure is used by the IFilter::BindRegion method.
  '''  </summary>
  <StructLayout(LayoutKind.Sequential)> _
  Public Structure FILTERREGION
    '  <summary>
    '   Chunk ID.
    '  </summary>
    Public idChunk As UInt32

    '  <summary>
    '   Beginning of the region, specified as an offset from the beginning of the chunk.
    '  </summary>
    Public cwcStart As UInt32

    '  <summary>
    '   Extent of the region, specified as a number of Unicode characters.
    '  </summary>
    Public cwcExtent As UInt32
  End Structure
```