Using FolderBrowserDialog in WPF application [duplicate]
Solution 1:
You need to add a reference to System.Windows.Forms.dll, then use the System.Windows.Forms.FolderBrowserDialog class.
Adding using WinForms = System.Windows.Forms; will be helpful.
Solution 2:
If I'm not mistaken you're looking for the FolderBrowserDialog (hence the naming):
var dialog = new System.Windows.Forms.FolderBrowserDialog();
System.Windows.Forms.DialogResult result = dialog.ShowDialog();
Also see this SO thread: Open directory dialog