C# WinForm窗体怎的判断是第一次启动应用程序！求方法或代码

C# WinForm窗体怎样判断是第一次启动应用程序！求方法或代码！
C# WinForm窗体怎样判断是第一次启动应用程序！求方法或代码！

[解决办法]

C# code

        /// <summary>        /// 写注册表中字串(REG_SZ)数据        /// </summary>        /// <param name="HKLM_SOFT_Dir_Name">HKLM\SOFTWARE的子项名称</param>        /// <param name="Sub_Dir_Name">\SOFTWARE\SOFT_Dir_Name\的子项的名称</param>        /// <param name="Key_Name">Sub_Dir_Name的子键名</param>        /// <param name="Key_Value">写入Key_Name的键值</param>        public void SetRegeditData(String HKLM_SOFT_Dir_Name, String Sub_Dir_Name, String Key_Name, String Key_Value)        {            RegistryKey hklm = Registry.LocalMachine.OpenSubKey("SOFTWARE", true);            RegistryKey software;            if (IsRegeditDirExist(HKLM_SOFT_Dir_Name))            {                software = hklm.OpenSubKey(HKLM_SOFT_Dir_Name, true);            }            else            {                software = hklm.CreateSubKey(HKLM_SOFT_Dir_Name);            }            RegistryKey aimdir = software.CreateSubKey(Sub_Dir_Name);            aimdir.SetValue(Key_Name, Key_Value);        }        /// <summary>        /// 判断目录是否存在        /// </summary>        /// <param name="HKLM_SOFT_Dir_Name">HKLM\SOFTWARE下是否存在该子项</param>        /// <returns>true or false</returns>        public bool IsRegeditDirExist(String HKLM_SOFT_Dir_Name)        {            bool _exit = false;            string[] subkeyNames;            RegistryKey hklm = Registry.LocalMachine.OpenSubKey("SOFTWARE", true);            subkeyNames = hklm.GetSubKeyNames();            foreach (string DirName in subkeyNames)            {                if (DirName == HKLM_SOFT_Dir_Name)                {                    _exit = true;                    return _exit;                }            }            return _exit;        }
[解决办法]
... 用什么注册表，App.config就可以了嘛。

C# code
string strIsFirstRun = "false";bool isFirstRun = false;strIsFirstRun = ConfigurationManager.AppSettings("IsFirstRun");if (string.IsNullOrEmpty(strIsFirstRun) || strIsFirstRun.ToLower() != "true"){   isFirstRun = false;}else{   isFirstRun = true;}strIsFirstRun = "false";Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);config.AppSettings.Settings.Remove("IsFirstRun");config.AppSettings.Settings.Add("IsFirstRun", strIsFirstRun);config.Save();