Repositories/UserRepository.cs

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using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;
using WPF_LoginForm.Models;

namespace WPF_LoginForm.Repositories
{
    public class UserRepository : RepositoryBase, IUserRepository
    {
        public void Add(UserModel userModel)
        {
            throw new NotImplementedException();
        }

        public bool AuthenticateUser(NetworkCredential credential)
        {
            bool validUser;
            using (var connection = GetConnection())
            using (var command = new SqlCommand())
            {
                connection.Open();
                command.Connection = connection;
                command.CommandText = "select *from [User] where username=@username and [password]=@password";
                command.Parameters.Add("@username", SqlDbType.NVarChar).Value = credential.UserName;
                command.Parameters.Add("@password", SqlDbType.NVarChar).Value = credential.Password;
                validUser = command.ExecuteScalar() == null ? false : true;
            }
            return validUser;
        }

        public void Edit(UserModel userModel)
        {
            throw new NotImplementedException();
        }
        public IEnumerable<UserModel> GetByAll()
        {
            throw new NotImplementedException();
        }
        public UserModel GetById(int id)
        {
            throw new NotImplementedException();
        }
        public UserModel GetByUsername(string username)
        {
            UserModel user = null;
            using (var connection = GetConnection())
            using (var command = new SqlCommand())
            {
                connection.Open();
                command.Connection = connection;
                command.CommandText = "select *from [User] where username=@username";
                command.Parameters.Add("@username", SqlDbType.NVarChar).Value = username;
                using (var reader = command.ExecuteReader())
                {
                    if (reader.Read())