c# - 画像を表示するために大容量メモリを使用するコード?

Question

Winforms と C# を使用して単純な画像ビューアーとエディターを作成していますが、この関数にあると思われる問題に直面しています。

    /// <summary>
    /// Extracts image details from specified image file.
    /// </summary>
    /// <param name="BitmapName">The name of file to process.</param>
    /// <param name="ImageName">The TextBox to recieve image name.</param>
    /// <param name="ImageCreated">The TextBox to recieve image creation date.</param>
    /// <param name="Size">The TextBox to recieve image size.</param>
    /// <param name="Width">The TextBox to recieve image width.</param>
    /// <param name="Height">The TextBox to recieve image height.</param>
    /// <param name="HResolution">The TextBox to recieve image's Horizontal Resolution.</param>
    /// <param name="VResolution">The TextBox to recieve image's Vertical Resolution.</param>
    /// <param name="Type">The TextBox to recieve the type of image.</param>
    /// <param name="Preview">The PictuteBox to display this image as a preview.</param>
    public void GetImageData(string BitmapName, TextBox ImageName, TextBox ImageCreated, TextBox Size, TextBox Width, TextBox Height, TextBox HResolution, TextBox VResolution, TextBox Type, PictureBox Preview)
    {
        try
        {
            FileInfo fileinfo = new FileInfo(BitmapName);
            ImageName.Text = fileinfo.Name;
            ImageCreated.Text = fileinfo.CreationTime.ToString();
            Size.Text = (fileinfo.Length / 1024).ToString() + " Kilobytes";
            Image image = Image.FromFile(BitmapName);
            Bitmap Bit = new Bitmap(image);
            Height.Text = Bit.Height.ToString() + " px";
            Width.Text = Bit.Width.ToString() + " px";
            HResolution.Text = Bit.HorizontalResolution.ToString() + " dpi";
            VResolution.Text = Bit.VerticalResolution.ToString() + " dpi";
            if (fileinfo.Extension == ".bmp" || fileinfo.Extension == ".BMP")
            {
                Type.Text = "Bitmap Image";
            }
            else if (fileinfo.Extension == ".jpeg" || fileinfo.Extension == ".JPEG")
            {
                Type.Text = "Jpeg Image";
            }
            else if (fileinfo.Extension == ".jpg" || fileinfo.Extension == ".JPG")
            {
                Type.Text = "Jpg Image";
            }
            else if (fileinfo.Extension == ".png" || fileinfo.Extension == ".PNG")
            {
                Type.Text = "Png Image";
            }
            else if (fileinfo.Extension == ".gif" || fileinfo.Extension == ".GIF")
            {
                Type.Text = "GIF Image";
            }
            Preview.Image = image;
            Bit.Dispose();
        }
        catch (OutOfMemoryException)
        {
            Preview.Image = Properties.Resources.InvalidImage;
        }
    }

、この関数は Bitmap クラスを使用して画像の詳細を抽出しますが、20 ～ 30 枚の画像を表示した後、ほぼ 600 ～ 700 MB の RAM を使用します。どこが間違っているのか教えてください。