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Well after digging a lot of sites found the solution but it seems to that it only supported in 4.0 and i need this in 3.5.
http://blogs.msdn.com/b/bclteam/archive/2007/02/13/long-paths-in-net-part-1-of-3-kim-hamilton.aspx
http://bcl.codeplex.com/wikipage?title=Long%20Path&referringTitle=Documentation
if you have better than this then please share.. i'll appreciate that.
Thanks