Microsoft.Win32.SaveFileDialog dlg = new Microsoft.Win32.SaveFileDialog();

                 dlg.FileName = "User.txt"; // Default file name

                 dlg.DefaultExt = ".txt"; // Default file extension

                 dlg.Filter = "Text documents (.txt)|*.txt"; // Filter files by extension

                 var dir = System.IO.Path.GetDirectoryName(this.txtPlace.Text);

                 dlg.InitialDirectory = dir;

                 // Show save file dialog box

                 Nullable<bool> result = dlg.ShowDialog();

                 // Process save file dialog box results

                 if (result == true)

                 {

                     // Save document

                     this.txtPlace.Text = dlg.FileName;

                 }