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Attempting to do SetData() on Texture2D that has been recently Draw()-n by SpriteBatch leads to following exception:
The operation was aborted. You may not modify a resource that has been set on a device, or after it has been used within a tiling bracket.
Can I determine in advance if executing SetData() will throw this exception?
Basically, you have three options:
1) See if SpriteBatch has finished it’s operation and call SetData() afterwards. The drawing methods usually are asynchronous. That means that, they just get added to the please-render-me queue and the method returns immediately. What you need is either a callback notification when the drawing has finished or a synchronous call to Draw().
2) Avoiding that SetData() gets interrupted. You can do that by putting it into a critical section which I would not recommend. It should be possible to lock the texture data. It’s called LockRect() in Direct3D, it should be similar in XNA.
3) There should be some method like Flush() somewhere that waits until all graphics-related operation have finished.
Sorry for the rather vague help, but you should be able to find the method names from the XNA doc.