
        private void button3_Click(object sender, EventArgs e)
        {
            DbDataReader rdr;
            DbProviderFactory provider = DbProviderFactories.GetFactory("System.Data.SqlClient");
            DbConnection cn = provider.CreateConnection();
            DbCommand cmd = provider.CreateCommand();
            cmd.CommandText = "SELECT * FROM stTable";
            cmd.Connection = cn;
            cn.ConnectionString = "Data Source=RAYANEH-C5E4683\\SQLEXPRESS;Initial Catalog = Student;Integrated Security=True";
            cn.Open();
            rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            DataTable dt = new DataTable("Student Display");
            dt.Load(rdr);
            dataGridView1.DataSource = dt;

        }

