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();        }