LastIndex of \\ substring

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C#

string

Hi, can someone hlep me to reverse the below logic so that I'm selecting the chars after the final \\. For example in this string C:\inetpub\TESTAPP I want to get the substring TESTAPP as it is after the last instance of the \.

Here's the code I'm using at present which is returning 'inetpub':

string dirpath = @"" + dir;
//Specs wants this to contain the name of the parent directory.
String ss = String.Empty;

int i = dir.LastIndexOf("\\");
ss = dir.Remove(i);
ss = ss.Substring(ss.LastIndexOf("\\") + 1);

string compressedDirpath = @"" + dir + "\\" + ss + ".gz";
string[] argd = { dirpath, compressedDirpath };