Implementing SQL Paging in ASP.Net

Rahul Saxena
9y
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The question is, why do we need SQL Paging when we already have built-in paging functionality in Grid View. Sometimes it's not a good habit to load all the data over the network, but instead to transfer only the data required, to improve performance. For that we have SQL paging. Pass only a Page Index and Page Size to load the required data.

The following is my data table structure from which I am fetching the data:

table design
                                       Image 1.

Data in my table:

                                                                          Image 2.

To do this, I created the following Stored Procedure:

                                                                          Image 3.

My Stored Procedure is:

ALTER PROCEDURE [dbo].[GetStudentData]
(
@PageIndex INT = 1,
@PageSize INT = 10,
@RecordCount INT OUTPUT
)
AS
BEGIN
SET NOCOUNT ON;
SELECT ROW_NUMBER() OVER
(
ORDER BY StudentID ASC
)AS RowNumber
,StudentID
,Name
,Email
,Class,EnrollYear,City INTO #Results FROM Student
SELECT * FROM #Results
WHERE RowNumber BETWEEN(@PageIndex -1) * @PageSize + 1 AND(((@PageIndex -1) * @PageSize + 1) + @PageSize) - 1
SELECT @RecordCount = COUNT(*) FROM #Results
DROP TABLE #Results
END

Now the aspx is:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="SQLPagingInGridView.aspx.cs" Inherits="SQLPaging.SQLPagingInGridView" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>SQL Paging Implementation in ASP.NET</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<table style="border: solid 15px blue; width: 100%; vertical-align: central;">
<tr>
<td style="padding-left: 50px; padding-top: 20px; padding-bottom: 20px; background-color: skyblue; font-size: 20pt; color: orangered;">SQL Paging Implementation in ASP.NET C#
</td>
</tr>
<tr>
<td style="text-align: left; padding-left: 50px; border: solid 1px red;">
<asp:GridView ID="GridViewStudent" runat="server" AutoGenerateColumns="False" Width="70%"
BackColor="White" BorderColor="#3366CC" BorderStyle="None" BorderWidth="1px" CellPadding="4" GridLines="Both">
<Columns>
<asp:BoundField DataField="Name" HeaderText="Student Name" />
<asp:BoundField DataField="Class" HeaderText="Class" />
<asp:BoundField DataField="EnrollYear" HeaderText="Enroll Year" />
<asp:BoundField DataField="City" HeaderText="City" />
</Columns>
<FooterStyle BackColor="#99CCCC" ForeColor="#003399" />
<HeaderStyle BackColor="#003399" Font-Bold="True" ForeColor="#CCCCFF" />
<PagerStyle BackColor="#99CCCC" ForeColor="#003399" HorizontalAlign="Left" />
<RowStyle BackColor="White" ForeColor="#003399" />
<SelectedRowStyle BackColor="#009999" Font-Bold="True" ForeColor="#CCFF99" />
<SortedAscendingCellStyle BackColor="#EDF6F6" />
<SortedAscendingHeaderStyle BackColor="#0D4AC4" />
<SortedDescendingCellStyle BackColor="#D6DFDF" />
<SortedDescendingHeaderStyle BackColor="#002876" />
</asp:GridView>
<br />
<asp:Repeater ID="rptPager" runat="server">
<ItemTemplate>
<asp:LinkButton ID="lnkPage" runat="server" Text='<%#Eval("Text") %>' CommandArgument='<%# Eval("Value") %>'
Enabled='<%# Eval("Enabled") %>' OnClick="lnkbtn_PageIndexChanged"></asp:LinkButton>
</ItemTemplate>
</asp:Repeater>
</td>
</tr>
</table>
</div>
</form>
</body>
</html>

My ASPX.CS code is:

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace SQLPaging
{
public partial class SQLPagingInGridView : System.Web.UI.Page
{
int PageSize = 10;
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
GetStudentData(1, PageSize);
}
SqlDataAdapter da;
DataSet ds = new DataSet();
public void GetStudentData(int PageIndex, int PageSize)
{
using (SqlConnection con = new SqlConnection(@"Data Source=MYPC\SqlServer2k8; Initial Catalog=SchoolManagement; Integrated Security=true;"))
{
using (SqlCommand cmd = new SqlCommand("[GetStudentData]", con))
{
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@PageIndex", PageIndex);
cmd.Parameters.AddWithValue("@PageSize", PageSize);
cmd.Parameters.Add("@RecordCount", SqlDbType.Int, 4);
cmd.Parameters["@RecordCount"].Direction = ParameterDirection.Output;
da = new SqlDataAdapter(cmd);
da.Fill(ds);
con.Open();
cmd.ExecuteNonQuery();
if (ds.Tables[0].Rows.Count > 0)
{
GridViewStudent.DataSource = ds.Tables[0];
GridViewStudent.DataBind();
}
int recordCount = Convert.ToInt32(cmd.Parameters["@RecordCount"].Value);
this.PopulatePager(recordCount, PageIndex);
}
}
}
private void PopulatePager(int recordCount, int currentPage)
{
double dblPageCount = (double)((decimal)recordCount / (PageSize));
int pageCount = (int)Math.Ceiling(dblPageCount);
List<ListItem> pages = new List<ListItem>();
if (pageCount > 0)
{
pages.Add(new ListItem("FIRST >> ", "1", currentPage > 1));
for (int i = 1; i <= pageCount; i++)
{
pages.Add(new ListItem(i.ToString(), i.ToString(), i != currentPage));
}
pages.Add(new ListItem(" << LAST", pageCount.ToString(), currentPage < pageCount));
}
rptPager.DataSource = pages;
rptPager.DataBind();
}
protected void lnkbtn_PageIndexChanged(object sender, EventArgs e)
{
int pageIndex = int.Parse((sender as LinkButton).CommandArgument);
GetStudentData(pageIndex, PageSize);
}
}
}

Now run the application.

sql paging

Image 4.

Image 5.

Image 6.

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