// if you have auth token:
var client =  new GitLabClient("https://gitlab.example.com", "your_private_token");

// if you want to use username & password:
var client =  new GitLabClient("https://gitlab.example.com");
await client.LoginAsync("username", "password");

// create a new issue.
await client.Issues.CreateAsync(new CreateIssueRequest("projectId", "issue title"));  

// list issues for a project  with specified assignee and labels.
await client.Issues.GetAsync("projectId", o => o.AssigneeId = 100 && o.Labels == new[] { "test-label" });

// create a new merge request featureBranch -> master.
await client.MergeRequests.CreateAsync(new CreateMergeRequest("projectId", "featureBranch", "master", "Merge request title")
{
    Labels = new[] { "bugfix" },
    Description = "Implement feature"
});