How to rename a file with string format in C#? -

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this situation: created new file name using string format like:

string newfilename = string.format("{0}/{1}/{2}/{3}.txt", fileinfo.year,             fileinfo.month, fileinfo.day, fileinfo.time);

and have another(old) file path: string path = @"c:\users\public\filename.txt" change or move old --> new. how that? possible change path of new? there can me. in advance 

 string path = @"c:\users\public\filename.txt";   if (file.exists(path))             file.move(path, "destinationfilepath");

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