Generic Paging for Recordset with Next Back Navigation

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
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 Paging
{
	/// <summary>
	/// Summary description for WebForm1.
	/// </summary>
	public class WebForm1 : System.Web.UI.Page
	{
		#region Private & Protected Variables
		protected System.Web.UI.WebControls.Table tbPickList;
		protected System.Web.UI.WebControls.Table Table1;
		protected System.Web.UI.WebControls.Table tblPaging;
		protected TableRow tr;
		//------------------------------------------------------
		private const int iShowNoPage=7;//-Change Parameter
		private static int jIter=7;//------Change Parameter
		private  int iTotalRec;//Change Paramater
		private static int iFirstStepMod;
		private static int iLastStep;
		private static int zIter=1;
		private  static int iCntMovePtr=1;
		private int iTotalPages;
		//-------------------------------------------------------
		protected System.Web.UI.WebControls.Button btnPrev;
		protected System.Web.UI.WebControls.Button btnNext;
		protected System.Web.UI.WebControls.Label Label1;
		protected System.Web.UI.WebControls.DropDownList ddlTotalRec;
		protected System.Web.UI.WebControls.Label Label2;
		protected System.Web.UI.WebControls.Button Button1;
		#endregion
		
		#region On Page Load
		private void Page_Load(object sender, System.EventArgs e)
		{
			// Put user code to initialize the page here
			//	if(!IsPostBack)
			//Button1.Attributes.Add("onclick","return alert(addDays(new Date(),10));");
			//LoadDynamicTable();
			//LoadStyleTable();
			// Button1.Attributes.Add("onclick","return alert(addDays(new Date('5/23/2006'),10));");	
			//------------------------------------------------------------------------------------	
			if(iCntMovePtr==1)
			{
				btnPrev.Visible=false;
			}
			CalculatePaging();
			
			//------------------------------------------------------------------------
}
		#endregion

		#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.btnPrev.Click += new System.EventHandler(this.btnPrev_Click);
			this.btnNext.Click += new System.EventHandler(this.btnNext_Click);
			this.ddlTotalRec.SelectedIndexChanged += new System.EventHandler(this.ddlTotalRec_SelectedIndexChanged);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		#region LoadDynamicTable()
		public void LoadDynamicTable()
		{
			TextBox _txt;
			CheckBox _chk;
			LinkButton _lnkBtn;
			tr=new TableRow();
			TableHeader("Id");
			TableHeader("Name");
			TableHeader("Links");
			TableHeader("SelectOption");
			
			for(int i=0;i<5;i++)
			{
				 tr=new TableRow();
				for(int j=0;j<4;j++)
				{
					TableCell tc=new TableCell();
					tc.BorderWidth=1;
					switch(j)
					{
						case 0:
							_txt=new TextBox();
							_txt.Text=j.ToString();
							tc.Controls.Add(_txt);
							break;
						case 1:
							_txt=new TextBox();
							_txt.Text=j.ToString();
							tc.Controls.Add(_txt);
							break;
						case 2:
							_lnkBtn=new LinkButton();
							_lnkBtn.Text="Link"+j;
							tc.Controls.Add(_lnkBtn);
							_lnkBtn.Click += new EventHandler(LinkClick);
							break;
						case 3:
							_chk=new CheckBox();
							_chk.Text="Select";
							tc.Controls.Add(_chk);
							break;
							
					}
					
				tr.Cells.Add(tc);
			
				}
				tbPickList.Rows.Add(tr);
			}
}
		#endregion

		#region LinkClick(Object sender, EventArgs e)
		public void LinkClick(Object sender, EventArgs e)
		{
		
		}
		#endregion

		#region TableHeader
		public void TableHeader(string strHeaderName)
		{
		
			TableHeaderCell tc=new TableHeaderCell();
			
			Literal li=new Literal();
			li.Text=strHeaderName;
			tc.Controls.Add(li);
			tc.BorderWidth=1;
			tr.Cells.Add(tc);
			tbPickList.Rows.Add(tr);
		
		}
		#endregion

		#region LoadStyleTable()
		public void LoadStyleTable()
		{
			string[] tmp = new string[10];
			string StrDump="San~SD~TYY~JKL~LJLJ~LJLJ~LLJ~LKKL~FG~RE";
			tr=new TableRow();
			TblHeader("30","Maturity Date");
			
			TblHeader("31","Maturity Date");
			
			TblHeader("31","Maturity Date");
			
			TblHeader("31","Maturity Date");
		
			TblHeader("31","Maturity Date");
			
			TblHeader("11","Maturity Date");
			
			TblHeader("11","Maturity Date");
			
			TblHeader("11","Maturity Date");
		
			TblHeader("11","Maturity Date");
			
			TblHeader("11","Maturity Date");
			Table1.Rows.Add(tr);
			

			if (StrDump!= "") 
			{
				tr = new TableRow();
				Label _lbl;
				TableCell tc;
				tmp = StrDump.Split("~".ToCharArray());
				Response.Write(tmp.Length);
				for(int i = 0; i<10;i++)
				{
					tc = new TableCell();
					_lbl=new Label();
					_lbl.Text=tmp[i];
					tc.Controls.Add(_lbl);
					tr.Cells.Add(tc);
			
				}
				Table1.Rows.Add(tr);
				}
		
		}
		#endregion

		#region TblHeader
		public void  TblHeader(string width,string HeaderName)
		{
			TableCell tc;
			tc=new TableCell();
			tc.Text=HeaderName;
			//tc.Width.Value;
			tc.Width = new Unit("5px");

			tc.CssClass="darkgray";
			tr.Cells.Add(tc);
			
		}	
		#endregion

		#region Paging
		public void ShowPaging()
		{
			tblPaging.Rows.Clear();
			
			TableRow tr=new TableRow();
			TableCell tc;
			LinkButton _li;
			if((iLastStep==iCntMovePtr && iFirstStepMod != 0) ||(iCntMovePtr == 1 && iTotalPages < iShowNoPage))
			{
				for(int iIter=zIter;iIter<=jIter-(iShowNoPage-iFirstStepMod);iIter++)
				{
					tc=new TableCell();
					_li=new LinkButton();
					_li.ID=Convert.ToString(iIter);
					_li.Text=Convert.ToString(iIter);
					_li.Click+=new EventHandler(LinkToRecord);
					tc.Controls.Add(_li);
					tr.Cells.Add(tc);
				}
				
			}
			else
			{
				for(int iIter=zIter;iIter<=jIter;iIter++)
				{
					tc=new TableCell();
					_li=new LinkButton();
					_li.ID=Convert.ToString(iIter);
					_li.Text=Convert.ToString(iIter);
					
					_li.Click+=new EventHandler(LinkToRecord);
					
					tc.Controls.Add(_li);
					tr.Cells.Add(tc);
			
				}
			}
			tblPaging.Rows.Add(tr);
	

		}
		#endregion

		#region On Page Link Button Click
		public void LinkToRecord(object sender,EventArgs e)
		{

			string strPageNo=((LinkButton)sender).ID;
			//Response.Write("LinkButton Clicked  "+strPageNo);
			Label1.Text="LinkButton Clicked  "+strPageNo;
			tblPaging.Rows.Clear();
			ShowPaging();
		}
		#endregion

		#region Next Navigation
		public void btnNext_Click(object sender, System.EventArgs e)
		{
			tblPaging.Rows.Clear();
			
			if(iLastStep>iCntMovePtr ||  iCntMovePtr>1)
			{
				btnPrev.Visible=true;
				iCntMovePtr++;
				zIter=zIter+iShowNoPage;
				jIter=iShowNoPage+jIter;
				ShowPaging();
		
				Label1.Text="LinkButton Clicked"+zIter;
				if(iCntMovePtr==iLastStep)
				{
					
					btnNext.Visible=false;
				
				}
			
			}


		
		}
		#endregion

		#region Previous Navigation Rec
		public void btnPrev_Click(object sender, System.EventArgs e)
		{
		
			tblPaging.Rows.Clear();
			if(iCntMovePtr>1)
			{
				btnNext.Visible=true;
				iCntMovePtr--;
			
				zIter=zIter - iShowNoPage;
				jIter=jIter - iShowNoPage;
	
				ShowPaging();

				Label1.Text="LinkButton Clicked"+zIter;
			
				if(iCntMovePtr==1)
				{
					btnPrev.Visible=false;
				}
			
			}
		

		
		}
		#endregion

		#region DropDown event
		public void ddlTotalRec_SelectedIndexChanged(object sender, System.EventArgs e)
		{	
			btnNext.Visible=true;
			jIter=7;
			zIter=1;
			iCntMovePtr=1;
			btnPrev.Visible=false;
			CalculatePaging();

		
		}
		#endregion

		#region CalculatePaging Interval
		public void CalculatePaging()
		{
			

			iTotalRec=Convert.ToInt16(ddlTotalRec.SelectedValue);
			if(iTotalRec % 10 !=0)
			{
				iTotalPages=iTotalRec/10+1;
			}
			else
			{
				iTotalPages=iTotalRec/10;
			}
			iFirstStepMod=iTotalPages%iShowNoPage;
			//	Response.Write("iFirstStepMod"+iFirstStepMod);
			if(iFirstStepMod!=0)
			{
				iLastStep=iTotalPages/iShowNoPage+1;
					
			}
			else
			{
				iLastStep=iTotalPages/iShowNoPage;
			}
			if(iTotalRec/10==0 || iTotalPages/iShowNoPage==0)
			{
				btnNext.Visible=false;
				
			}
			if(iTotalRec!=0)
			{
				ShowPaging();
				Label1.Text="LinkButton Clicked  1";
			}
			else
			{
				Label1.Text="Sorry Records found .";
			}
		}

		#endregion
	}
}