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Select Data With Enums Via EDF Framework 5.0

By Vijay Prativadi on December 15, 2012
Today, in this article let’s play around with one of the interesting and most useful concepts in Entity Data Model Framework 5.0.
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Introduction
 
Today, in this article let's play around with one of the interesting and most useful concepts in Entity Data Model Framework 5.0.
 
Question: What is select data using enums via EDM Framework 5.0?
 
In simple terms "It provides the flexibility to pull data using enums using the Entity Framework 5.0".
 
Step 1: Create a new web application:

Enums via EDF Framework1.jpg

Step 2: Add a new ADO.NET entity data model, as in:

Enums via EDF Framework2.jpg

Enums via EDF Framework3.jpg

Enums via EDF Framework4.jpg

Enums via EDF Framework5.jpg

Enums via EDF Framework6.jpg

Enums via EDF Framework7.jpg

Step 3: The complete code of WebForm1.aspx looks like this:

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

 

<!DOCTYPE html>

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

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

    <style type="text/css">

        .grid

        {

            margin-top: 50px;

        }

    </style>

    <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 with Enums Types via Entity Framework 5.0"

                            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" />

                        </asp:GridView>

                    </td>

                </tr>

                <tr>

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

                        <asp:Label ID="Label3" runat="server" Font-Bold="true" Font-Size="Medium" Font-Names="Verdana"></asp:Label>

                    </td>

                </tr>

            </table>

        </div>

    </center>

    </form>

</body>

</html>

Step 4: The complete code of WebForm1.aspx.cs looks like this:
 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

namespace EnumEFApp

{

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

    {

        protected void Page_Load(object sender, EventArgs e)

        {

        }

        protected void Button1_Click(object sender, EventArgs e)

        {

            var query = (from r in objEntities.Employee

                         where r.Location == LocationName.Nepal

                         select new

                             {

                                 FirstName = r.FirstName,

                                 LastName = r.LastName,

                                 Age = r.Age,

                                 Location = r.Location

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

        }

        #region Instance

        MembersCompanyEntities2 objEntities = new CompanyEntities2();

        #endregion

    }

}


Step 5: The output of the application looks like this:


Enums via EDF Framework8.jpg


Step 6: The selected data output of the application looks like this:


Enums via EDF Framework9.jpg

Vijay Prativadi

Hey Everyone, It's Vijay. I am SDE mostly up on Microsoft Technologies. If you are thinking to know what I do mostly when at work. I get a chance to work upon few Microsoft technologies. All the way along my core tech... Read more

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