If you want to have directory or file selection dialog box then you can use
FolderBrowserDialog or
OpenFileDialog.
Sample code for the same are shown below
FolderBrowserDialog fbDialog = new FolderBrowserDialog();
if (fbDialog.ShowDialog() == DialogResult.OK)
Console.WriteLine("Selected folder: " + fbDialog.SelectedPath);
OpenFileDialog ofDialog = new OpenFileDialog();
if (ofDialog.ShowDialog() == DialogResult.OK)
Console.WriteLine("Selected file: " + ofDialog.FileName);
Its much much simpler and easy approach for the same.