Database Connectivity

protected void Page_Load(object sender, EventArgs e)
    {
        try
        {
            // Declare new Dataset object
            DataSet dataset = new DataSet();
            // Declare new SQL Command object
            SqlCommand cmd = new SqlCommand("select Product.prdId, Product.prdName, Table1.weight from Product inner join Table1 ON Product.prdId = Table1.ProductId");
            cmd.CommandType = CommandType.Text;
            // Declare SQL Data Adapter object
            SqlDataAdapter dataAdapter;
            // Declare new SQL Connection object
            SqlConnection reportConnection = new SqlConnection( "Data Source=.\\sqlexpress;Initial Catalog=master;Integrated Security=True");
            cmd.Connection = reportConnection;
            //reportConnection = cmd.Connection;
            // Open database Connection
            reportConnection.Open();
            // Initialize the data adapter object with command object
            dataAdapter = new SqlDataAdapter(cmd);
            dataAdapter.SelectCommand = cmd;
            // Fill the dataset
            dataAdapter.Fill(dataset);
            testGrid.DataSource= dataset.Tables[0];
            testGrid.DataBind();
          
        }
        catch (Exception ex)
        {
            throw ex;
        }