[Solved] I want to save user data on client’s machine for c# app [closed]

Question

I would use App.config and access the settings using the ConfigurationManager.AppSettings class.

App.Config

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
    </startup>
  <appSettings>
    <add key="Setting1" value="true"/>
    <add key="Setting2" value="value"/>
  </appSettings>
</configuration>

Access settings from your application with the following

bool setting1 = Convert.ToBolean(ConfigurationManager.AppSettings["Setting1"]);
string setting2 = ConfigurationManager.AppSettings["Setting2"];

To update settings create a static helper method

public static void UpdateAppSetting(string key, string value)
{
    var configuration = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
    configuration.AppSettings.Settings[key].Value = value;
    configuration.Save();

    ConfigurationManager.RefreshSection("appSettings");
}

See the link below for more examples.

https://msdn.microsoft.com/en-us/library/system.configuration.configurationmanager.appsettings(v=vs.110).aspx

Accepted Answer