vs2019怎么编辑按钮使其点击后弹出选文件窗口？

vs2019的窗体，想要点击按钮后弹出供选择文件

//选择文件
OpenFileDialog dialog = new OpenFileDialog();
dialog.Multiselect = true;//该值确定是否可以选择多个文件
dialog.Title = "请选择文件夹";
dialog.Filter = "所有文件(*.*)|*.*";
if (dialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
    string file = dialog.FileName;
}