实现效果:

知识运用:
DirectoryInfo类的MoveTo方法
public void MoveTo (string destDirName)
实现代码:
private void button3_Click(object sender, EventArgs e)
{
try
{
DirectoryInfo Dinfo=new DirectoryInfo(textBox1.Text);
string strPath = textBox2.Text + textBox1.Text.Substring(
textBox1.Text.LastIndexOf("\")+1,textBox1.Text.Length-textBox1.Text.LastIndexOf("\")-1);
Dinfo.MoveTo(strPath);
}
catch{}
}