mine, C# - rextester

mine

using Microsoft.EntityFrameworkCore;
using System;
using System.Linq;
using static System.Console;

namespace EF_DataAcess
{
    class Program
    {
        private static readonly LoginCred ob2;
        private static  AppContext builder = new AppContext();

static void Main(string[] args)
        {
            Console.WriteLine("Program Execution Starts.........");
            int id,optn = 1;
            string passwrd = "";
            while (optn != -1)
            {
                if (optn == 1) Display();
                if (optn == 2)
                {
                    id = Convert.ToInt32(ReadLine());
                    passwrd = ReadLine();
                    insert(id, passwrd);
                }
                if (optn == 3)
                {
                    id = Convert.ToInt32(ReadLine());
                    remove(id);
                }
                WriteLine("Enter your choice");
                optn = Convert.ToInt32(ReadLine());

}
            Console.WriteLine("Operation Ends.......................");
        }

static void insert(int id,string password)
        {
            WriteLine("Insert operation executed");
            var ob = new LoginCred();
            ob.Id = id;
            ob.Password = password;
            builder.LoginCreds.Add(ob);
            builder.SaveChanges();

}

static void remove(int id)
        {
            WriteLine("Remove operation executed");
            var ob = new LoginCred() { Id = id };
            builder.LoginCreds.Remove(ob);
            builder.SaveChanges();
        }

static void Display()
        {
            WriteLine("Displaying data:");
            var res = builder.LoginCreds;
            foreach(var ob in res)
            {
                WriteLine(ob.Id);
            }
        }
    }
}


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