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where can i download .net for the #51? how can i see the obfusction options for it?
Your question is similar to: "Where do I buy a Caterpillar bulldozer blade for my bicycle?"
It doesn't matter if you pay or not. The 8051 processor is similar to the processor in the keyboard of your PC. Or similar to the processor in your PC mouse. There is a huge difference between a PC and the kind of equipment you find 8051 processors in. So don't try to write PC-class programs for an 8051.