Get Web groups with permissions using CSOM

The following example returns all the Groups with permissions associated to the SharePoint Web suing Managed Client Side Object Model.

After creating a console application project in Visual Studio solution, add the below assembly references to the project.

Microsoft.SharePoint.Client

Microsoft.SharePoint.Client.Runtime

using Microsoft.SharePoint.Client;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Text;

namespace GetWebGroups
{
    class Program
    {
        static void Main(string[] args)
        {
            //Get Site Url fro user
            Console.Write("Enter Site URL: ");
            string strURL = Console.ReadLine();

            //Get Username from user in the format of (Domain/Login ID)
            Console.Write("Enter UserName (domain/userid): ");
            string strUserName = Console.ReadLine();

            Console.Write("Enter your password: ");
            string pass = getPassword();
            Console.WriteLine();

            ClientContext ctx = new ClientContext(strURL);
            ctx.Credentials = new NetworkCredential(strUserName, pass);
            Web web = ctx.Web;
            //Parameters to receive response from the server
            //RoleAssignments property should be passed in Load method to get the collection of Groups assigned to the web
            ctx.Load(web, w => w.Title);
            RoleAssignmentCollection roleAssignments= web.RoleAssignments;
            //RoleAssignment.Member property returns the group associated to the web
            //RoleAssignement.RoleDefinitionBindings property returns the permissions associated to the group for the web
            ctx.Load(roleAssignments, roleAssignement => roleAssignement.Include(r => r.Member, r => r.RoleDefinitionBindings));
            ctx.ExecuteQuery();

            Console.WriteLine("Groups has permission to the Web: " + web.Title);
            Console.WriteLine("Groups Count: " + roleAssignments.Count.ToString());
            Console.WriteLine("Group with Permissions as follows:");
            foreach (RoleAssignment grp in roleAssignments)
            {
                string strGroup = "";
                strGroup += grp.Member.Title +" : ";

                foreach (RoleDefinition rd in grp.RoleDefinitionBindings)
                {
                    strGroup += rd.Name+ " ";
                }
                Console.WriteLine(strGroup);
            }
            Console.Read();
        }

        private static string getPassword()
        {
            ConsoleKeyInfo key;
            string pass = "";
            do
            {
                key = Console.ReadKey(true);
                // Backspace Should Not Work
                if (key.Key != ConsoleKey.Backspace && key.Key != ConsoleKey.Enter)
                {
                    pass += key.KeyChar;
                    Console.Write("*");
                }
                else
                {
                    if (key.Key == ConsoleKey.Backspace && pass.Length > 0)
                    {
                        pass = pass.Substring(0, (pass.Length - 1));
                        Console.Write("\b \b");
                    }
                }
            }
            // Stops Receving Keys Once Enter is Pressed
            while (key.Key != ConsoleKey.Enter);
            return pass;
        }
    }
}