求一个c#.Net的winForm的小程序！急急急急

timer的enable初始状态为false

private void button1_Click(object sender, EventArgs e)

{

timer1.Enabled = true

i = textBox1.Text.Trim().Length

}

string str = ""

int i=0

private void timer1_Tick(object sender, EventArgs e)

{

if (str.Length <i)

{

str = textBox1.Text.Trim().Substring(textBox1.Text.Trim().Length - 1) + str

}

textBox1.Text = textBox1.Text.Trim().Substring(0, textBox1.Text.Trim().Length - 1)

if (textBox1.Text.Length <= 0)

{

textBox1.Text = str

}

}

private void button2_Click(object sender, EventArgs e)

{

timer1.Enabled = false

str = ""

}

这种程序我以前做过，我把这个相关的代码写在百度空间了 地址是

http://hi.baidu.com/hapgaoyi/blog/item/2820a75133a0c5571138c259.html

如果还想进一步的了解，那么可以和我交流。

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