Editing Web.config programmatically

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This fellow shows sample code if you still want to do it after all the caveats:

protected void EditConfigButton(object sender, EventArgs e)
{
   Configuration objConfig = System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration("~");
   AppSettingsSection objAppsettings = (AppSettingsSection)objConfig.GetSection("appSettings");
   //Edit
   if (objAppsettings != null)
   {
      objAppsettings.Settings["test"].Value = "newvalueFromCode";
      objConfig.Save();
   }
}

One valid reason for editing a web.config is to encrypt it, which is what that article is about.

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