   private void button2_Click(object sender, EventArgs e)
        {
            SqlConnection cnSource = new SqlConnection("Data Source=RAYANEH-C5E4683\\SQLEXPRESS;Initial Catalog= Student;Integrated Security=True");
            SqlConnection cnDest = new SqlConnection("Data Source=RAYANEH-C5E4683\\SQLEXPRESS;Initial Catalog= St;Integrated Security=True");
            cnSource.Open();
            cnDest.Open();
            SqlCommand cmd;
            cmd = new SqlCommand("SELECT * FROM selTable", cnSource);
            SqlDataReader rdr = cmd.ExecuteReader();
            SqlBulkCopy bulkData = new SqlBulkCopy(cnDest);
            bulkData.DestinationTableName = "selTable";
            bulkData.WriteToServer(rdr);
            bulkData.Close();
            cnSource.Close();
            cmd = new SqlCommand("SELECT * FROM selTable", cnSource);
            cnSource.Open();
            rdr = cmd.ExecuteReader();
            DataTable dt = new DataTable("selTable");
            dt.Load(rdr);
            dataGridView1.DataSource = dt;
            cnSource.Close();
            cnDest.Close();
            MessageBox.Show("Table selTable copy to St");
        }
