authorstrigger.aspx.cs

Microsoft?ASP.NET Programming with Microsoft Visual C#?.NET Version 2003 Step By Step

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Web;
using System.Web.Caching;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace Chapter_12
{
	/// <summary>
	/// Summary description for AuthorsTrigger.
	/// </summary>
	public class AuthorsTrigger : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.Label title;
		protected System.Web.UI.WebControls.DataGrid MyGrid;
		protected System.Web.UI.WebControls.Label Message;
	
		private void Page_Load(object sender, System.EventArgs e)
		{
			DataSet DS = (DataSet)Cache["myDS"];
			if (DS != null) 
			{
				Message.Text = "Dataset retrieved from cache";
			}
			else
			{
				DS = GetData();
				Cache.Insert("myDS", DS, 
					new CacheDependency(Server.MapPath("authors.htm")));
				Message.Text = "Dataset retrieved from database";
			}
			MyGrid.DataSource = DS.Tables[0].DefaultView;
			MyGrid.DataBind();
		}

		private DataSet GetData()
		{
			DataSet myDS = new DataSet();
			string ConnStr;

			// Use @ so we do not need to escape
			//    backslash character.
			ConnStr = @"server=(local)\VsDotNet;";
			ConnStr += "database=pubs;Trusted_Connection=yes";
			string SQLSelect;
			SQLSelect = "SELECT au_id, au_lname, au_fname, ";
			SQLSelect += "zip FROM Authors WHERE zip = '94609'";
			SqlConnection mySqlConn = new SqlConnection(ConnStr);
			SqlDataAdapter mySqlDA = new SqlDataAdapter(SQLSelect, ConnStr);
			mySqlDA.Fill(myDS);
			return myDS;
		}

		#region Web Form Designer generated code
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN: This call is required by the ASP.NET Web Form Designer.
			//
			InitializeComponent();
			base.OnInit(e);
		}
		
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{    
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion
	}
}