DataList pagination (Codebehind part)

Paging using System;
Using System.Collections;
Using System.Configuration;
Using System.ComponentModel;
Using System.Data;
Using System.Data.SqlClient;
Using System.Drawing;
Using System.Web;
Using System.Web.SessionState;
Using System.Web.UI;
Using System.Web.UI.WebControls;
Using System.Web.UI.HtmlControls;

Namespace cj168. Web
{
<summary>
Summary description for search.
</summary>
public class Search:System.Web.UI.Page

{
protected System.Web.UI.WebControls.DataList Datalistsearchresult;
protected System.Web.UI.WebControls.Label Lbltxtsearch;
protected System.Web.UI.WebControls.Label Lblrecordcount;
protected System.Web.UI.WebControls.Label lblcurrentpage;
protected System.Web.UI.WebControls.Label Lblpagecount;
protected System.Web.UI.WebControls.Label Lblpagerange;

protected System.Web.UI.WebControls.LinkButton lbnprevpage;
protected System.Web.UI.WebControls.LinkButton lbnnextpage;
String Txtsearch;
int pagesize,recordcount,pagecount,currentpage;


Public Search ()
{
Page.Init + = new System.EventHandler (Page_Init);
}

private void Page_Load (object sender, System.EventArgs e)
{
Put user code to initialize the page here
Txtsearch = request.params["Txtsearch"];
if (Txtsearch!= null)
{Txtsearch = Txtsearch.replace ("'", "");

Lbltxtsearch.text = Txtsearch;

Set pagesize
PageSize = 10;

Calculate how many records are in total
RecordCount = Calculaterecord ();
Lblrecordcount.text = Recordcount.tostring ();

if (! Page.IsPostBack)

{


Dosearch ();
currentpage = 0;
viewstate["PageIndex"] = 0;



Calculate how many pages are in total
PageCount = recordcount/pagesize;
if (recordcount%pagesize > 0)
PageCount = PageCount + 1;
Lblpagecount.text = Pagecount.tostring ();
viewstate["PageCount"] = PageCount;


}
}




}

Calculate how many records are in total
public int Calculaterecord ()
{
cj168. Dataaccess.magsdb dosearch = new cj168. Dataaccess.magsdb ();
Return Dosearch.getsearchresultcount (Txtsearch);

}



void Dosearch ()
{
int StartIndex;
int Fromitem, Toitem;

Set the start address of the import
StartIndex = currentpage*pagesize;

cj168. Dataaccess.magsdb dosearch = new cj168. Dataaccess.magsdb ();
Datalistsearchresult.datasource = Dosearch.getsearchresult (Txtsearch,startindex, PageSize);
Datalistsearchresult.databind ();

Lbnnextpage.enabled = true;
Lbnprevpage.enabled = true;
if (currentpage== (PageCount-1)) lbnnextpage.enabled = false;
if (currentpage==0) lbnprevpage.enabled = false;
Lblcurrentpage.text = (currentpage+1). ToString ();

Fromitem = startindex+1;
Toitem = startindex+pagesize;

if (RecordCount < Toitem)
Toitem = RecordCount;

Lblpagerange.text = Fromitem + "-" + toitem;

}




public void Page_onclick (Object Sender,commandeventargs e)
{
currentpage = (int) viewstate["PageIndex"];
PageCount = (int) viewstate["PageCount"];

string cmd = E.commandname;
Judge Cmd to determine the direction of page flipping
Switch (CMD)
{
Case "Next":
if (currentpage< (PageCount-1)) currentpage++;
Break
Case "Prev":
if (currentpage>0) currentpage--;
Break
}

viewstate["PageIndex"] = currentpage;

Dosearch ();


}



private void Page_Init (object sender, EventArgs e)
{
//
Codegen:this the call are required by the ASP.net Web Form Designer.
//
InitializeComponent ();
}

#region Web Form Designer generated code
<summary>
Required to Designer support-do not modify
The contents is with the Code Editor.
</summary>
private void InitializeComponent ()
{
This. Load + = new System.EventHandler (this. Page_Load);

}
#endregion
}
}