代码是:
        private void button1_Click(object sender, EventArgs e)
        {
            if (BrowserDialog.ShowDialog() == DialogResult.Cancel)
             txtDSPath.Text = null;
            else
             txtDSPath.Text = BrowserDialog.SelectedPath.ToString().Trim() + "\\" + "Backup.bak";
        }
图中的D：\\Backup.bak多了一个“\”
不知该怎么改才能去除这个“\”

判断尾字符是否为"\"，该怎么写？