Helppanite I do authorization for Kursoch

ошибка pixs.ru/showimage/tGUIRNSoqc_4801605_29762834.jpg[/IMG]
код

SqlConnection cn = new SqlConnection("Data Source=(local);Initial Catalog=login1;Integrated Security=True");
cn.Open();
SqlCommand cmd = new SqlCommand("select * from user1 where username = '" +textBox1.Text+ "' and password = '" +textBox2.Text+ "'", cn);
SqlDataReader dr;
dr = cmd.ExecuteReader () ;
int count = 0;
while (dr.Read())
{
count += 1;

}
if (count == 1)
{
MessageBox.Show("Успешно вошли");
Form3 f3 = new Form3();
f3.Show();

}
else if (count >0)
{
MessageBox.Show ("дубликат");
}
else
{
MessageBox.Show("Логин или пароль введен не правильно");
}

textBox1.Clear();
textBox2.Clear();

Code

 SqlConnection cn = new SqlConnection("Data Source=(local);Initial Catalog=login1;Integrated Security=True");

            cn.Open();

            SqlCommand cmd = new SqlCommand("select * from user1 where username = '" +textBox1.Text+ "' and password = '" +textBox2.Text+ "'", cn);

            SqlDataReader dr;

            dr = cmd.ExecuteReader () ;

            int count = 0;

            while (dr.Read())

            {

                count += 1;



            }

            if  (count == 1)

            {

                MessageBox.Show("Успешно вошли");

                Form3 f3 = new Form3();

                f3.Show();

               

            }

            else  if (count >0)

            {

                MessageBox.Show ("дубликат");

            }

            else

            {

                MessageBox.Show("Логин или пароль введен не правильно");

            }



            textBox1.Clear();

            textBox2.Clear();