Question

Can we save data or some text in app.config file
if yes then it is persistence or temporary ?

for example if i store last access date time in app.config file and then close/Exit the application after the some time/days/years when i start my application is it possible that the last access date time I can retrieve. If yes then how please explain with code ….

Thanks,
Raj

here is my code ..

Trying to retrieve date time from config file..
But show error object not set to be an object like…

System.Configuration.Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);

if (email.To.Contains(Email) && DateTime.Compare(email.UtcDateTime.Date, Convert.ToDateTime(config.AppSettings.Settings["ModificationDate"].Value)) > 0)

Here i store /save the date time in app.config file.

System.Configuration.Configuration config =
             ConfigurationManager.OpenExeConfiguration
                        (ConfigurationUserLevel.None);

// Add an Application Setting.
config.AppSettings.Settings.Add("ModificationDate", DateTime.Now + " ");

// Save the changes in App.config file.
config.Save(ConfigurationSaveMode.Modified);

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

Console.WriteLine("Last Update :"+config.AppSettings.Settings["ModificationDate"].Value);
Console.ReadLine();

Please suggest me why it show me an error that object not set am done any mistake please ans…

Answer 1

You can create a settings xml file to do this.

In VS go to your project properties -> Settings, then write a value in.

In code, you can get/set that value using

Properties.Settings.Default.YourVariable = 0;

If you are setting the value make sure to save it

Properties.Settings.Default.Save();

See here for a good tutorial.