Работа с SQL. Incorrect syntax near '='

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
using System.Threading.Tasks;
 
namespace TrainingProject.App_Data
{
    public class Connection
    {
        private string stringConnection = @"Data Source=(LocalDB)\v11.0;AttachDbFilename=C:\Users\alexs\Desktop\Main project\TrainingProject\TrainingProject\App_Data\dbUsers.mdf;Integrated Security=True";
        SqlConnection sqlConnection;
        public void addUsers(string Login, string Surname, string Name, string Middlename, string Password) 
        {
            string addUsersToDB = "INSERT INTO [Users] (Login, Surname, Name, Middlename, Password) VALUES(" + Login + ", " + Surname + " ," + Name + " ," + Middlename + ", " + Password + ")";
            try{
                sqlConnection = new SqlConnection(stringConnection);
                sqlConnection.Open();
                SqlCommand addUsersCommand = new SqlCommand(addUsersToDB, sqlConnection);
                addUsersCommand.ExecuteNonQuery();
                sqlConnection.Close();
            }
            catch(Exception ex){
                MessageBox.Show("Ошибка подлючения! " + ex.Message.ToString());
            }
        }
    }
}