asp.net mvc 5 - how to create a folder with user name or email? -

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i've tried make folder whenever registered system don't know how create name of user name or user email help?

this should you're looking for

string directorypath = server.mappath(string.format("~/{0}/", txtfoldername.text.trim()));     if (!directory.exists(directorypath))     {         directory.createdirectory(directorypath);     }

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