Try like this
string gesturefile= Path.Combine(Environment.CurrentDirectory, @"GesturePak\wave.xml");
Examples:
http://msdn.microsoft.com/en-us/library/fyy7a5kt(v=vs.110).aspx http://www.dotnetperls.com/path
or
Use Path.GetFullPath
Example : http://msdn.microsoft.com/en-us/library/system.io.path.getfullpath.aspx