How to create a raster classify renderer

public IRasterRenderer ClassifyRenderer(ESRI.ArcGIS.Geodatabase.IRasterDataset
    rasterDataset)
{
    try
    {
        //Create the classify renderer.
        IRasterClassifyColorRampRenderer classifyRenderer = new
            RasterClassifyColorRampRendererClass();
        IRasterRenderer rasterRenderer = (IRasterRenderer)classifyRenderer;

        //Set up the renderer properties.
        IRaster raster = rasterDataset.CreateDefaultRaster();
        rasterRenderer.Raster = raster;
        classifyRenderer.ClassCount = 3;
        rasterRenderer.Update();

        //Set the color ramp for the symbology.
        IAlgorithmicColorRamp colorRamp = new AlgorithmicColorRampClass();
        colorRamp.Size = 3;
        bool createColorRamp;
        colorRamp.CreateRamp(out createColorRamp);

        //Create the symbol for the classes.
        IFillSymbol fillSymbol = new SimpleFillSymbolClass();
        for (int i = 0; i < classifyRenderer.ClassCount; i++)
        {
            fillSymbol.Color = colorRamp.get_Color(i);
            classifyRenderer.set_Symbol(i, (ISymbol)fillSymbol);
            classifyRenderer.set_Label(i, Convert.ToString(i));
        }
        return rasterRenderer;
    }
    catch (Exception ex)
    {
        System.Diagnostics.Debug.WriteLine(ex.Message);
        return null;
    }
}

Public Function ClassifyRenderer(ByVal rasterDataset As ESRI.ArcGIS.Geodatabase.IRasterDataset) As IRasterRenderer
    Try
    'Create the classify renderer.
    Dim classifyRenderer As IRasterClassifyColorRampRenderer = New RasterClassifyColorRampRendererClass()
    Dim rasterRenderer As IRasterRenderer = CType(classifyRenderer, IRasterRenderer)
    
    'Set up the renderer properties.
    Dim raster As IRaster = rasterDataset.CreateDefaultRaster()
    rasterRenderer.Raster = raster
    classifyRenderer.ClassCount = 3
    rasterRenderer.Update()
    
    'Set the color ramp for the symbology.
    Dim colorRamp As IAlgorithmicColorRamp = New AlgorithmicColorRampClass()
    colorRamp.Size = 3
    Dim createColorRamp As Boolean
    colorRamp.CreateRamp( createColorRamp)
    
    'Create the symbol for the classes.
    Dim fillSymbol As IFillSymbol = New SimpleFillSymbolClass()
    Dim i As Integer
    For i = 0 To classifyRenderer.ClassCount - 1 Step i + 1
        fillSymbol.Color = colorRamp.get_Color(i)
        classifyRenderer.set_Symbol(i, CType(fillSymbol, ISymbol))
        classifyRenderer.set_Label(i, Convert.ToString(i))
    Next
    Return rasterRenderer
    Catch ex As Exception
    System.Diagnostics.Debug.WriteLine(ex.Message)
    Return Nothing
    End Try
End Function