Temporarily change connection string in app.config

Question

I have a DB2 environment, to which I would like to connect with Entity Framework. To do that, I need a connection string which looks like this, in the app.config file:

<connectionStrings>
  <add name="DB2Connect" connectionString="Database=my_db; UID=Username; PWD=Password;"/>
</connectionStrings>

It doesn't seem like a good idea to have a password hardcoded into the app.config file, so I would like to replace it at run time, but only temporarily! The temporary part, is what is causing me trouble. I have successfully managed to replace the connection string, with the following code, but it's no good when the password remains in the the app.config file, afterwards:

private static void SaveConnectionString(string name, string connectionString)
{
    Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
    var connectionStringsSection = (ConnectionStringsSection)config.GetSection("connectionStrings");
    connectionStringsSection.ConnectionStrings[name].ConnectionString = connectionString;
    config.Save();
    ConfigurationManager.RefreshSection("connectionStrings");
}

Answer 1

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