Programmatically Modify ConnectioString from Properties.Settings.Default c#

Modifying ConnectioString from App Settings Programmatically on c#

if(Properties.Settings.Default.appConnectionString3 != ConfigurationManager.ConnectionStrings["cn"].ConnectionString)
            {
                Properties.Settings.Default["appConnectionString3"] = ConfigurationManager.ConnectionStrings["cn"].ConnectionString;
                Properties.Settings.Default.Save();
            }


You can edit 'cn' from AppConfig
<add name="cn" connectionString="Data Source=(localDB)\MSSQLLocalDB;AttachDbFilename=|DataDirectory|\app.mdf;Integrated Security=True"
            providerName="System.Data.SqlClient" />

    
</connectionStrings>

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