C#

Image tmp1 = Image.FromFile("../../Bitmap1.jpg");				
Image img = new Bitmap(100,100);			
Rectangle srcRect = new Rectangle(0,0,50,50);
Rectangle destRect = new Rectangle(0,0,20,100);			
		
Graphics g = Graphics.FromImage(img);
pictureBox1.Image = img;
g.DrawImage(tmp1, destRect, srcRect, GraphicsUnit.Pixel);			
g.Dispose();
tmp1.Dispose();

Remarks<br />
You must keep the stream open for the lifetime of the Image object.

public void Load(Stream sm)
{
    Clear();
    int len = (int) sm.Length;
    byte[] buf = new byte[len];
    sm.Read(buf,0,len);
    	
    _ms = new MemoryStream(buf);
    _bm = (Bitmap) Image.FromStream(_ms);
}

public void Load(string fileName)
{
    FileStream fs = new FileStream(fileName,FileMode.Open,FileAccess.Read);
    Load(fs);
    fs.Close();
}

public void Load(object dbField)
{
    Clear();
    if (dbField != DBNull.Value)
    {
        byte[] buf = (byte[])dbField;
        _ms = new MemoryStream(buf);
        _bm = (Bitmap) Image.FromStream(_ms);
    }
}

public void Clear()
{
    if (_bm != null)
    {
        _bm.Dispose();
        _bm = null;
    }
    if (_ms != null)
    {
        _ms.Close();
        _ms = null;
    }
}

public Bitmap Bitmap
{
    get {return _bm;}
}

o.SomeFunctionInDerivedClass();

object obj = Activator.CreateInstance(passedType);
obj.GetType().InvokeMember("SomeFunctionInDerivedClass",...);

MyBaseClass o = AnInstanceOfMyDerivedClass;

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