#region crop image

    enum Dimensions
    {

        Width,

        Height

    }

    enum AnchorPosition
    {

        Top,

        Center,

        Bottom,

        Left,

        Right

    }

    public static void CropImage(Bitmap imgStr, int Width, int Height, string filename)
    {
        //creo il bitmap dallo stream
        System.Drawing.Image bmpStream = imgStr;

        System.Drawing.Image imgPhoto = Crop(bmpStream, Width, Height, AnchorPosition.Center);
        imgPhoto.Save(filename, ImageFormat.Jpeg);
        imgPhoto.Dispose();
    }

    public static void CropImage(Bitmap imgStr, int Width, int Height, int X, int Y, string filename)
    {
        //creo il bitmap dallo stream
        System.Drawing.Image bmpStream = imgStr;

        System.Drawing.Image imgPhoto = Crop(bmpStream, Width, Height, X, Y);
        imgPhoto.Save(filename, ImageFormat.Jpeg);
        imgPhoto.Dispose();
    }

    static System.Drawing.Image Crop(System.Drawing.Image imgPhoto, int Width, int Height, AnchorPosition Anchor)
    {
        int sourceWidth = imgPhoto.Width;
        int sourceHeight = imgPhoto.Height;
        int sourceX = 0;
        int sourceY = 0;
        int destX = 0;
        int destY = 0;

        float nPercent = 0;
        float nPercentW = 0;
        float nPercentH = 0;

        nPercentW = ((float)Width / (float)sourceWidth);
        nPercentH = ((float)Height / (float)sourceHeight);

        if (nPercentH > nPercentW)
        {
            nPercent = nPercentW;
            switch (Anchor)
            {
                case AnchorPosition.Top:
                    destY = 0;
                    break;
                case AnchorPosition.Bottom:
                    destY = (int)
                        (Height - (sourceHeight * nPercent));
                    break;
                default:
                    destY = (int)
                        ((Height - (sourceHeight * nPercent)) / 2);
                    break;
            }
        }
        else
        {
            nPercent = nPercentH;
            switch (Anchor)
            {
                case AnchorPosition.Left:
                    destX = 0;
                    break;
                case AnchorPosition.Right:
                    destX = (int)
                        (Width - (sourceWidth * nPercent));
                    break;
                default:
                    destX = (int)
                        ((Width - (sourceWidth * nPercent)) / 2);
                    break;
            }
        }

        int destWidth = (int)(sourceWidth * nPercent);
        int destHeight = (int)(sourceHeight * nPercent);

        Bitmap bmPhoto = new Bitmap(Width,
            Height, PixelFormat.Format24bppRgb);
        bmPhoto.SetResolution(imgPhoto.HorizontalResolution,
            imgPhoto.VerticalResolution);


        Graphics grPhoto = Graphics.FromImage(bmPhoto);
        grPhoto.InterpolationMode =
            InterpolationMode.HighQualityBicubic;
        grPhoto.Clear(Color.White);
        grPhoto.DrawImage(imgPhoto,
            new Rectangle(destX, destY, destWidth, destHeight),
            new Rectangle(sourceX, sourceY, sourceWidth, sourceHeight),
            GraphicsUnit.Pixel);


        grPhoto.Dispose();
        return bmPhoto;
    }

    static System.Drawing.Image Crop(System.Drawing.Image imgPhoto, int Width, int Height, int X, int Y)
    {
        if (Width > imgPhoto.Width) Width = imgPhoto.Width;
        if (Height > imgPhoto.Height) Height = imgPhoto.Height;

        if (X > (imgPhoto.Width - Width)) X = (imgPhoto.Width - Width);
        if (Y > (imgPhoto.Height - Height)) Y = (imgPhoto.Height - Height);

        Bitmap bmPhoto = new Bitmap(Width, Height, PixelFormat.Format24bppRgb);//creo img vuota
        bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);

        Graphics grPhoto = Graphics.FromImage(bmPhoto);
        grPhoto.InterpolationMode = InterpolationMode.HighQualityBicubic;
       
        grPhoto.DrawImage(imgPhoto, new Rectangle(0, 0, Width, Height), new Rectangle(X, Y, Width, Height), GraphicsUnit.Pixel);

        grPhoto.Dispose();
        return bmPhoto;
    }
    #endregion