Example of creating an issue on Jira using Restsharp

CreateIssueJiraUsingRestsharp.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using Jira
using RestSharp;
using RestSharp.Authenticators;

namespace Jira
{
    class Program
    {
      static void Main(string[] args)
      {
        var client = new RestClient("http://{URL}/rest/api/2");
        var request = new RestRequest("issue/", Method.POST);
  
        client.Authenticator = new HttpBasicAuthenticator("user", "pass");
        
        var issue = new Issue
        {
            fields =
                new Fields
                {
                    description = "Issue Description",
                    summary = "Issue Summary",
                    project = new Project { key = "KEY" }, 
                    issuetype = new IssueType { name = "ISSUE_TYPE_NAME" }
                }
        };
        
        request.AddJsonBody(issue);
        
        var res = client.Execute<Issue>(request);
        
        if (res.StatusCode == HttpStatusCode.Created)
            Console.WriteLine("Issue: {0} successfully created", res.Data.key);
        else
            Console.WriteLine(res.Content);
      }
    }
    
    public class Issue
    {
        public string id { get; set; }
        public string key { get; set; }
        public Fields fields { get; set; }
    }
    
    public class Fields
    {
        public Project project { get; set; }
        public IssueType issuetype { get; set; }
        public string summary { get; set; }
        public string description { get; set; }        
    }
    
    public class Project
    {
        public string id { get; set; }
        public string key { get; set; }
    }
    
    public class IssueType
    {
        public string id { get; set; }
        public string name { get; set; }
    }
}