How to save date of last application run-time?

My current approach is开发者_开发技巧 to store date in .settings file and update it at the end of program, but it doesn't work.

code:

Settings.Default.RunTime = DateTime.Today;
Settings.Default.Save();

how to fix it?

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In Properties -> Settings, make sure the name of the setting is "RunTime", the type is "System.DateTime", and the scope is "user". After that, you should be able to use the following code:

// Access setting    
Properties.Settings.Default.RunTime= DateTime.Today;
// Save all settings
Properties.Settings.Default.Save();

If you would like more information on application settings, check out this MSDN article.