search file using wildcard in c#

How you can search file using wildcard in c#

string[] files = Directory.GetFiles(@"E:\ ", "User*", SearchOption.AllDirectories);

foreach (string file in files)
        {
MessageBox.Show(dir);
        }
it will serach all files which starts with User and in E: drive.

in messagebox it will give you the full path of a file.