实现效果:

知识运用:
Guid结构的NewGuid方法 //用来初始化Guid结构的一个新实例
public static Guid NewGuid () //返回值: 新的Guid对象
实现代码:
private void button1_Click(object sender, EventArgs e)
{
FolderBrowserDialog P_fb = new FolderBrowserDialog();
if (P_fb.ShowDialog() == DialogResult.OK)
{
File.Create(P_fb.SelectedPath+"\"+
Guid.NewGuid().ToString()+".txt"); //根据GUID生成文件名
}
}
private void button2_Click(object sender, EventArgs e)
{
FolderBrowserDialog P_fb = new FolderBrowserDialog();
if (P_fb.ShowDialog() == DialogResult.OK)
{
Directory.CreateDirectory(P_fb.SelectedPath + "\" +
Guid.NewGuid().ToString()); //根据GUID生成文件夹
}
}