How to georeference a raster using polynomial transformation

public static void GeoreferenceRaster(IRasterDataset2 rasterDataset,
    IPointCollection sourcePoints, IPointCollection targetPoints)
{
    // The sourcePoints represent source control points.
    // The targetPoints represent target control points.

    IRasterGeometryProc rasterPropc = new RasterGeometryProcClass();
    IRaster raster = rasterDataset.CreateFullRaster();

    //Set the transformation. The number of control points must meet the minimum requirements 
    //of the order of transformation. The first order polynomial must have at least 3 non-correlated 
    //points; the second order polynomial must have at least 6; and the third order must have at 
    //least 10 control points.

    rasterPropc.Warp(sourcePoints, targetPoints,
        esriGeoTransTypeEnum.esriGeoTransPolyOrder1, raster);

    //There are two ways to get the georeferenced result: Save the transformation with the 
    //input raster dataset,
    rasterPropc.Register(raster);

    //or save to another new raster dataset.
    rasterPropc.Rectify(@"c:\temp\georeferencing_output.img", "IMAGINE Image",
        raster);
}

Public Shared Sub GeoreferenceRaster(ByVal rasterDataset As IRasterDataset2, ByVal sourcePoints As IPointCollection, ByVal targetPoints As IPointCollection)
' The sourcePoints represent source control points.
' The targetPoints represent target control points.

Dim rasterPropc As IRasterGeomeTryProc = New RasterGeomeTryProcClass()
Dim raster As IRaster = rasterDataset.CreateDefaultRaster()

'Set the transformation.
rasterPropc.Warp(sourcePoints, targetPoints, esriGeoTransTypeEnum.esriGeoTransPolyOrder1, raster)

'There are two ways to get the georeferenced result: Save the transformation with the input
'raster dataset,

rasterPropc.Register(raster)

'or save to another new raster dataset.
rasterPropc.Rectify("c:\temp\georeferencing_output.img", "IMAGINE Image", raster)
End Sub