Sometimes we need to get local machine date format string.Example The User tell us  they want to see the date has same format as their compute.

I spent some time to find the method by using Google,but I failed. At last I found the way by myself.And below is my method.

    CultureInfo cultureInfo=CultureInfo.CurrentCulture;

    string localMachineShortDateFormat=cultureInfo.DateTimeFormat.ShortDatePattern;

Finally I found a very very easy way

DateTimeFormatInfo.CurrentInfo.ShortDatePattern 

And I got some useful code.

    CultureInfo currCI = System.Threading.Thread.CurrentThread.CurrentCulture;
    CultureInfo engCI = new CultureInfo("en-US",false);
    System.Threading.Thread.CurrentThread.CurrentCulture = engCI;

And I got some puzzles too.

    CultureInfo destCI = System.Threading.Thread.CurrentThread.CurrentCulture;
    CultureInfo osCI = System.Globalization.CultureInfo.InstalledUICulture;
    CultureInfo overrideCI = LanguageManager.SystemCultureInfo;