在D盘中创建文件夹
winform 窗体

代码
private void button1_Click(object sender, EventArgs e)
{
string path = "D:\\Picture";
CreatDir(path);
}
public void CreatDir(string path)
{
if (!Directory.Exists(path)) {
Directory.CreateDirectory(path);
} else {
MessageBox.Show("所创的文件夹已存在");
}
}