private void onUploadTrainCSVFile(object sender, RoutedEventArgs e) { Microsoft.Win32.OpenFileDialog openFileDialog = new Microsoft.Win32.OpenFileDialog(); openFileDialog.Multiselect = false; openFileDialog.Filter = "CSV Files|*.csv|Excel Files|*.xlsx"; bool?response = openFileDialog.ShowDialog(); if (response == true) { trainCSVPathTextbox.Text = openFileDialog.FileName; startMenuVM.updateTrainCSVPath(openFileDialog.FileName); uploadTrainCSVButton.IsEnabled = false; startButton.IsEnabled = true; } }