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我是用visual studio 2012 C#，想請教各位為何我下列程式碼中的this.CreateGraphics()和this.Size及this.ClientRectangle都會顯示不包含其定義，也找不到擴充方法??

private void CaptureScreen()
{
Graphics mygraphics = mygraphics = this.CreateGraphics();
Size s = this.Size;
memoryImage = new Bitmap(s.Width, s.Height, mygraphics);
Graphics memoryGraphics = Graphics.FromImage(memoryImage);
IntPtr dc1 = mygraphics.GetHdc();
IntPtr dc2 = memoryGraphics.GetHdc();
BitBlt(dc2, 0, 0, this.ClientRectangle.Width, this.ClientRectangle.Height, dc1, 0, 0, 13369376);
mygraphics.ReleaseHdc(dc1);
memoryGraphics.ReleaseHdc(dc2);
}

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