Chomo.Window1.btnDestination_Click C# (CSharp) Method

        private void btnDestination_Click(object sender, RoutedEventArgs e)
        {
            var saveFileDialog = new Microsoft.Win32.SaveFileDialog();
            saveFileDialog.FileName = "Select File to Convert";

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

            if (result == true)
            {
                entDestination.Text = saveFileDialog.FileName.ToLower();
                if (!(entDestination.Text.EndsWith(".shp") ||
                       entDestination.Text.EndsWith(".kml")))
                {
                    entDestination.Text = "Extension Must be SHP or KML";
                    btnConvert.IsEnabled = false;
                }
                else
                {
                    if (entSource.Text.EndsWith(".shp") ||
                           entSource.Text.EndsWith(".kml"))
                    {
                        btnConvert.IsEnabled = true;
                    }
                }
            }
        }