Winforms模拟键盘输入

private void button1_Click(object sender, EventArgs e)
{
	this.textBox1.Focus();
	//模拟键盘输入字符
	SendKeys.Send("300");
	//模拟键盘输入Backspace键
	//SendKeys.Send("{BACKSPACE}");               
	SendKeys.Flush();
}