protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
        string medicineName = this.MedicineName.Text;

        this.GridView1.DataSourceID = null;
        this.GridView1.DataSource   = MedicineLogic.QueryMedicineInfo(medicineName);
        this.GridView1.PageIndex    = e.NewPageIndex;
        this.GridView1.DataBind();
    }
    protected void Btn_Query_Click(object sender, EventArgs e)
    {
        string medicineName = this.MedicineName.Text;

        this.GridView1.DataSourceID = null;
        this.GridView1.DataSource   = MedicineLogic.QueryMedicineInfo(medicineName);
        this.GridView1.PageIndex    = 0;
        this.GridView1.DataBind();
    }