C#设置透明按钮样式

/// 

/// 设置透明按钮样式
/// 
private void SetBtnStyle(Button btn)
{
    btn.FlatStyle = FlatStyle.Flat;//样式
    btn.ForeColor = Color.Transparent;//前景
    btn.BackColor = Color.Transparent;//去背景
    btn.FlatAppearance.BorderSize = 0;//去边线
    btn.FlatAppearance.MouseOverBackColor = Color.Transparent;//鼠标经过
    btn.FlatAppearance.MouseDownBackColor = Color.Transparent;//鼠标按下
}
private void btn_MouseHover(object sender, EventArgs e)
{
    Button btn = sender as Button;
    btn.FlatAppearance.BorderSize = 1;
}

private void btn_MouseLeave(object sender, EventArgs e)
{
    Button btn = sender as Button;
    btn.FlatAppearance.BorderSize = 0;
}