how to solve Syntax error (missing operator) in query expression '(Username ='aa') = (Password'aa')'.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.OleDb;

namespace Final
{
    public partial class Login : Form
    {
        private OleDbConnection connection = new OleDbConnection();
        public Login()
        {
            InitializeComponent();
            connection.ConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\SunilK\Desktop\Final\Final\DB\Login.accdb;
Persist Security Info=False;";
        }

        private void Login_Load(object sender, EventArgs e)
        {
            try
            {
                connection.Open();

                CHKConn.Text = "Connected Sucessfully";

                connection.Close();
            }
            catch (Exception snk)
            {
                MessageBox.Show("Error  " + snk);
            }
        }

        private void textBox2_TextChanged(object sender, EventArgs e)
        {

        }

        private void btnLogin_Click(object sender, EventArgs e)
        {
            connection.Open();

            OleDbCommand command = new OleDbCommand();
            command.Connection = connection;
            command.CommandText = "select count(*) from [LoginDB] where (Username ='" + txtUsername.Text + "') = (Password'" + txtPassword.Text + "')";

            OleDbDataReader reader = command.ExecuteReader();
            int count = 0;
            while (reader.Read())
            {
                count = count + 1;
            }

            if (count == 1)
            {
                MessageBox.Show("Login Sucessfully");
            }
            else
            {
                MessageBox.Show("Login unSucessfully");
            }
            connection.Close();
        }
    }
}