The best replacement for sharpdevelop is visual studio.

The best alternatives to sharpdevelop are rated as following:
★★★★★  visual studio
★★  monodevelop
★  visual studio express
  visual c# express

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Speaking about sharpdevelop, one probably shouldn't forget about ironpython.

Other search terms related to sharpdevelop and their ratings are:
★★★★★ ironpython
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