protected void Button3_Click(object sender, EventArgs e)
    {
        hydropower ad = new hydropower();
        DataSet abc = ad.GetAll();

        GridView1.DataSource = abc;
        GridView1.DataBind();
    }
    protected void Button4_Click(object sender, EventArgs e)
    {
        string qq = "Data Source=gz-20150728tajv\\sqlexpress;Initial Catalog=Student1;Integrated Security=True ";
        SqlConnection Conn = new SqlConnection(qq);
        Conn.Open();
        string SQL = "UPDATE Hydropower SET " + TextBox7.Text + "='" + TextBox8.Text + "' where 编号='" + TextBox6.Text + "'";
        SqlCommand cmd = new SqlCommand(SQL, Conn);
        cmd.ExecuteNonQuery();
        Conn.Close();

        hydropower ad = new hydropower();
        DataSet abc = ad.GetAll();

        GridView1.DataSource = abc;
        GridView1.DataBind();
    }