defaultcs.aspx.cs

Telerik是很大的第三方软件制造商

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Data.OleDb;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using Telerik.QuickStart;
using Telerik.WebControls;

namespace Telerik.CallbackExamplesCSharp.Demos.Configurator
{
	/// <summary>
	/// Summary description for _Default.
	/// </summary>
	public class DefaultCS: XhtmlPage
	{
		protected CallbackDropDownList CallbackDropDownList3;
		protected System.Web.UI.WebControls.Label Label1;
		protected System.Web.UI.WebControls.Label Label2;
		protected Telerik.WebControls.CallbackDropDownList ddlProcessor;
		protected Telerik.WebControls.CallbackDropDownList ddlMemory;
		protected Telerik.WebControls.CallbackDropDownList ddlMonitor;
		protected Telerik.WebControls.CallbackDropDownList ddlHdd;
		protected System.Web.UI.WebControls.Label Label3;
		protected System.Web.UI.WebControls.Label lblCPU;
		protected System.Web.UI.WebControls.Label lblMemory;
		protected System.Web.UI.WebControls.Label lblHDD;
		protected System.Web.UI.WebControls.Label lblMonitor;
		protected Telerik.WebControls.LoadingPanel LoadingPanel1;
		protected System.Web.UI.HtmlControls.HtmlImage Img1;
		protected System.Web.UI.WebControls.Label lblTotal;

		private void PopulateDropDown(string category, CallbackDropDownList ddl, OleDbConnection conn)
		{
			ddl.Items.Clear();
			DataTable dt = new DataTable();
			OleDbDataAdapter adapter = new OleDbDataAdapter();
			adapter.SelectCommand = new OleDbCommand("SELECT * FROM " + category, conn);
			adapter.Fill(dt);
			
			ddl.DataTextField = "Name";
			ddl.DataValueField = "ID";
			ddl.DataSource = dt;
			ddl.DataBind();
			ddl.Items.Insert(0, category);
			ddl.SelectedIndex = 0;
		}
		
		private void LoadData()
		{
			string path = Server.MapPath("~/Callback/data/data.mdb");
			OleDbConnection dbCon = new OleDbConnection ("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + path); 
			dbCon.Open();
			
			PopulateDropDown("PROCESSOR", ddlProcessor, dbCon);
			PopulateDropDown("MEMORY", ddlMemory, dbCon);			
			PopulateDropDown("HDD", ddlHdd, dbCon);
			PopulateDropDown("MONITOR", ddlMonitor, dbCon);
			
			dbCon.Close();			
		}

		private void Page_Load(object sender, System.EventArgs e)
		{
			if (!Page.IsPostBack)
			{
				LoadData();				
			}
		}

		#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.ddlProcessor.SelectedIndexChanged += new System.EventHandler(this.ddlProcessor_SelectedIndexChanged);
			this.ddlMemory.SelectedIndexChanged += new System.EventHandler(this.ddlMemory_SelectedIndexChanged);
			this.ddlHdd.SelectedIndexChanged += new System.EventHandler(this.ddlHdd_SelectedIndexChanged);
			this.ddlMonitor.SelectedIndexChanged += new System.EventHandler(this.ddlMonitor_SelectedIndexChanged);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		private decimal GetPrice(string category, int componentIndex)
		{	
			if (componentIndex < 1) return 0;
			string path = Server.MapPath("~/Callback/data/data.mdb");
			OleDbConnection dbCon = new OleDbConnection ("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + path); 
			dbCon.Open();						
			OleDbCommand command = new OleDbCommand(string.Format("SELECT price FROM {0} WHERE id = {1}", category, componentIndex), dbCon);
			decimal price = (decimal) command.ExecuteScalar();
			dbCon.Close();			
			return price;
		}

		private void CalcTotal()
		{
			decimal cpu		= GetPrice("PROCESSOR", ddlProcessor.SelectedIndex);
			decimal memory	= GetPrice("MEMORY", ddlMemory.SelectedIndex);
			decimal monitor = GetPrice("MONITOR", ddlMonitor.SelectedIndex);
			decimal hdd		= GetPrice("HDD", ddlHdd.SelectedIndex);
						
			lblTotal.Text = "$" + (cpu + memory + monitor + hdd).ToString();
		}

		private void ddlProcessor_SelectedIndexChanged(object sender, System.EventArgs e)
		{
			if (ddlProcessor.SelectedIndex > 0)
			{
				lblCPU.Text = GetPrice("PROCESSOR", ddlProcessor.SelectedIndex).ToString();
			}
			else
			{
				lblCPU.Text = "0";
			}
			CalcTotal();
			lblCPU.Text = "$" + lblCPU.Text;
		}

		private void ddlMemory_SelectedIndexChanged(object sender, System.EventArgs e)
		{
			if (ddlMemory.SelectedIndex > 0)
			{
				lblMemory.Text = GetPrice("MEMORY", ddlMemory.SelectedIndex).ToString();
			}
			else
			{
				lblMemory.Text = "0";
			}
			CalcTotal();
			lblMemory.Text = "$" + lblMemory.Text ;
		}

		private void ddlHdd_SelectedIndexChanged(object sender, System.EventArgs e)
		{
			if (ddlHdd.SelectedIndex > 0)
			{
				lblHDD.Text = GetPrice("HDD", ddlHdd.SelectedIndex).ToString();
			}
			else
			{
				lblHDD.Text = "0";
			}			
			CalcTotal();
			lblHDD.Text = "$" + lblHDD.Text ;
		}

		private void ddlMonitor_SelectedIndexChanged(object sender, System.EventArgs e)
		{
			if (ddlMonitor.SelectedIndex > 0)
			{
				lblMonitor.Text = GetPrice("MONITOR", ddlMonitor.SelectedIndex).ToString();
			}
			else
			{
				lblMonitor.Text = "0";
			}			
			CalcTotal();
			lblMonitor.Text = "$" + lblMonitor.Text;
		}
	}
}