Create a client:
var credentials = DiscogsApiClientCredentials.FromToken("<TOKEN>");
var environment = DiscogsApiClientEnvironment.CreateDefault(credentials);
var client = DiscogsApiClient.Create(environment);
Use it:
var db = client.Database;
var searchResults = await db.Search("Bang Bang");
var releases = searchResults.Releases;
var artists = searchResults.Artists;
For complete example check out Playground.