The RotateImage method

I see this method in the Graphics namespace:

public void RotateImage(int angle, int xDst, int yDst, Image image, int xSrc, int ySrc, int width, int height, ushort opacity)

Can someone tell me how to use to draw vertical text on a screen without drawing an opaque box as wide as the text is wide horizontally?

Or how to use the MakeTransparent() method to simulate this. either/or.

Thanks for any help that can be offered.