How to add rasters to a Mosaic dataset

public void AddRastersToMD(IMosaicDataset theMosaicDataset, IRasterType
    theRasterType)
{
    // Create a file crawler.
    IDataSourceCrawler myCrawler = new FileCrawlerClass();
    // Specify the source path.
    ((IFileCrawler)myCrawler).Path = @"C:\TestData";
    // Specify whether to search subdirectories.
    ((IFileCrawler)myCrawler).Recurse = true;
    // Specify a file filter.
    ((IFileCrawler)myCrawler).Filters = ".TIF";

    // The mosaic dataset operation interface is used to perform operations on 
    // a mosaic dataset.
    IMosaicDatasetOperation theMosaicDatasetOperation = (IMosaicDatasetOperation)
        (theMosaicDataset);
    // Create an AddRaster parameters object.
    IAddRastersParameters AddRastersArgs = new AddRastersParametersClass();
    // Specify the data crawler to use to crawl the data.
    AddRastersArgs.Crawler = myCrawler;
    // Specify the raster type to use to add the data.
    AddRastersArgs.RasterType = theRasterType;
    // Use the mosaic dataset operation interface to add 
    // rasters to the mosaic dataset.
    theMosaicDatasetOperation.AddRasters(AddRastersArgs, null);
}

Public Sub AddRastersToMD(ByVal theMosaicDataset As IMosaicDataset, ByVal theRasterType As IRasterType)
    ' Create a file crawler.
    Dim theCrawler As IDataSourceCrawler = New FileCrawler()
    Dim myFileCrawler As IFileCrawler = theCrawler
    ' Specify a file filter.
    myFileCrawler.Filters = ".TIF"
    ' Specify whether to search subdirectories.
    myFileCrawler.Path = "C:\TestData"
    ' Specify the source path.
    myFileCrawler.Recurse = True
    
    ' The mosaic dataset operation interface is used to perform operations on
    ' a mosaic dataset.
    Dim theMosaicDatasetOperation As IMosaicDatasetOperation =
    DirectCast((theMosaicDataset), IMosaicDatasetOperation)
    
    ' Create an AddRaster parameters object.
    Dim AddRastersArgs As IAddRastersParameters = New AddRastersParametersClass()
    ' Specify the data crawler to use to crawl the data.
    AddRastersArgs.Crawler = theCrawler
    ' Specify the raster type to use to add the data.
    AddRastersArgs.RasterType = theRasterType
    ' Use the mosaic dataset operation interface to add
    ' rasters to the mosaic dataset.
    theMosaicDatasetOperation.AddRasters(AddRastersArgs, Nothing)
End Sub