Blocking a sender in gmail

I am developing a application blocking a sender in gmail filter through c#.net. I am a using gmail api to block a sender using the following line,

GoogleMailSettingsService service = new开发者_C百科 GoogleMailSettingsService("yourdomain", "your-apps");

what is "yourdomain" and "your-apps" fields.

Or

Kindly advice how to block a sender in gmail thorough a c#.net code.

The Google API is specified here Email Settings Developers Guide