JD’s Blog
Developer Musings

Updating the .config file from a .net 2.0 application
10 April 2006 in .Net, Code, Intergen | Comments enabled

This is more for my own reminder but somebody else might find it useful. This code allows you to update the value of a config key in your .net 2.0 application. It also updates the section so subsequent reads from the .config will reflect that change. Really useful when you just need to store a single peice of information.

In this example I’m setting a last run date.

// Open the app.config
System.Configuration.Configuration config = ConfigurationManager
.OpenExeConfiguration(ConfigurationUserLevel.None);

// Update the last run time 
config.AppSettings.Settings["LastRunDate"].Value
= lastRunTime.ToString();

// Save the configuration file
config.Save(ConfigurationSaveMode.Modified);

// Force a reload of a changed section.
ConfigurationManager.RefreshSection("appSettings");

- JD