Select Data - No Tracking in Entity Framework

Introduction

 

This article demonstrates an interesting and very useful concept in Entity Framework.

Question: What is no tracking?

 

In simple terms "This is a new extension method, that can be used on entity classes when querying on a large quantity of data, that in turn may result in better query performance".

Step 1: Create a new web application

 

new-project.png

 

Step 2: Adding a new Entity Framework:

 

add-new-item.png

 

Step 3: The complete code of WebForm1.aspx is as in the following:


<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="SelectDataNoTrackingApp.WebForm1" %>

 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head id="Head1" runat="server">

    <title></title>

</head>

<body>

    <form id="form1" runat="server">

    <center>

        <div>

            <table>

                <tr>

                    <td colspan="2" align="center">

                        <asp:Label ID="Label1" runat="server" Text="Select Data - No Tracking" Font-Bold="true"

                            Font-Size="Large" Font-Names="Verdana" ForeColor="Maroon"></asp:Label>

                    </td>

                </tr>

                <tr>

                    <td colspan="2" align="center">

                        <asp:Button ID="Button1" runat="server" Text="Select Data" Font-Names="Verdana" Width="213px"

                            BackColor="Orange" Font-Bold="True" OnClick="Button1_Click" />

                    </td>

                </tr>

                <tr>

                    <td colspan="2" align="center">

                        <asp:GridView ID="GridView1" runat="server" CssClass="grid" BackColor="LightGoldenrodYellow"

                            BorderColor="Tan" BorderWidth="1px" CellPadding="2" ForeColor="Black" GridLines="None">

                            <AlternatingRowStyle BackColor="PaleGoldenrod" />

                            <FooterStyle BackColor="Tan" />

                            <HeaderStyle BackColor="Tan" Font-Bold="True" />

                            <PagerStyle BackColor="PaleGoldenrod" ForeColor="DarkSlateBlue" HorizontalAlign="Center" />

                            <SelectedRowStyle BackColor="DarkSlateBlue" ForeColor="GhostWhite" />

                            <SortedAscendingCellStyle BackColor="#FAFAE7" />

                            <SortedAscendingHeaderStyle BackColor="#DAC09E" />

                            <SortedDescendingCellStyle BackColor="#E1DB9C" />

                            <SortedDescendingHeaderStyle BackColor="#C2A47B" />

                            <EmptyDataTemplate>

                                No Records Found!</EmptyDataTemplate>

                        </asp:GridView>

                    </td>

                </tr>

            </table>

        </div>

    </center>

    </form>

</body>

</html>

 

Step 4: The complete code of WebForm1.aspx.cs is as in the following:


 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Data.Entity;

namespace SelectDataNoTrackingApp

{

    public partial class WebForm1 : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {

        }

        protected void Button1_Click(object sender, EventArgs e)

        {

            using (CompanyEntities objEntities = new CompanyEntities())

            {

                var query = objEntities.tblEmployee.AsNoTracking();

                GridView1.DataSource = query; GridView1.DataBind();

            }

        }

    }

}


Step 5:
 The output of the application is as in the following:

 

no-tracking.png

 

Step 6: The selected data output of the application is as in the following:

 

display-record.png

 

I hope this article was useful for you.

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