private void button1_Click(object sender, EventArgs e)
 {
     using (var dialog = new OpenFileOrFolderDialog())
     {
         dialog.AcceptFiles = true;
         dialog.Path        = @"C:\";
         dialog.ShowDialog();
     }
 }
 private void button1_Click(object sender, EventArgs e)
 {
     using (var dialog = new OpenFileOrFolderDialog())
     {
         dialog.AcceptFiles = true;
         dialog.Path = @"C:\";
         dialog.ShowDialog();
     }
 }