在openGL中跨两个显示上下文同时更新

I have a C# .NET application with which I've created a custom image display control. Each image display represents its own display context and draws the image using glDrawPixels (Yes I know it would be better to use textures, I plan to in the futures but this app is already too far along and my time is limited).I have a C# .NET application with which I've cr