private void txtTest_KeyUp(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Enter)
{
if (MessageBox.Show("输入完了？", this.Text, MessageBoxButtons.YesNo, MessageBoxIcon.Question)
== System.Windows.Forms.DialogResult.Yes)
{
this.lblTest.Text = this.txtTest.Text;
}

}
}

private void txtTest_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Enter)
{
if (MessageBox.Show("输入完了？", this.Text, MessageBoxButtons.YesNo, MessageBoxIcon.Question)
== System.Windows.Forms.DialogResult.Yes)
{
this.lblTest.Text = this.txtTest.Text;
}

}
}