C#清除SQL挂起

using Microsoft.Win32; //操作注册表需要引用的空间
private void but_Del_Click(object sender, EventArgs e)
        {
            //指定路径
            RegistryKey key = Registry.LocalMachine;
            RegistryKey SoftKey = key.OpenSubKey("SYSTEM\\CurrentControlSet\\Control\\Session Manager", true);
            string[] subkeyNames = SoftKey.GetValueNames();
            //取得该项下所有键值的名称的序列，并传递给预定的数组中
            foreach (string keyName in subkeyNames)
            {
                if (keyName == "PendingFileRenameOperations") //判断键值的名称
                {
                    SoftKey.DeleteValue("PendingFileRenameOperations",true);
                    MessageBox.Show("清除SQL挂起成功！");
                }
            }
            SoftKey.Close();
            key.Close();
        }