Delete Data With Reverse Engineering Via EDM Framework

Introduction

 

Today, in this article let's play around with one of the interesting and most useful concept in EDM Framework.

 

Question: What is delete data with reverse engineering via EDM framework?

 

In simple terms "It provides flexibility to delete the data using reverse engineering via EDM framework".

 

Step 1: Create a new web application
 

Output1.jpg
 

Step 2: Set up a new EDM framework with reverse engineering for the project
 

Output2.jpg
 

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

 

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

    <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="Delete Data with Reverse Engg via Entity Framework"

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

                    </td>

                </tr>

                <tr>

                    <td>

                        <asp:Label ID="Label2" runat="server" Text="Please Enter Employee Id" ForeColor="Brown"

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

                    </td>

                    <td>

                        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>

                    </td>

                </tr>

                <tr>

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

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

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

                    </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;

using DeleteDataReverseEnggApp.Models;

using System.Data;

namespace DeleteDataReverseEnggApp

{

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

    {

        protected void Page_Load(object sender, EventArgs e)

        {

        }

        protected void Button1_Click(object sender, EventArgs e)

        {

            if (string.IsNullOrEmpty(TextBox1.Text))

            {

                Label3.Text = "Please Enter Some Values";

                Label3.ForeColor = System.Drawing.Color.Red;

            }

            else

            {

                tblEmployee deleteQuery;

                int empId = Convert.ToInt32(TextBox1.Text);

                sing (var objContext = new CompanyContext())

                {

                    deleteQuery = (from r in objContext.tblEmployeeswhere r.EmpId == empIdselect r).Single();

                }

                deleteEmployee(deleteQuery);

                Label3.Text = "Data Deleted Successfully";

                Label3.ForeColor = System.Drawing.Color.Green;

                TextBox1.Text = string.Empty;

            }

        }

        private void deleteEmployee(tblEmployee employee)

        {

            using (var objContext = new CompanyContext())

            {

                objContext.Entry(employee).State = EntityState.Deleted; objContext.SaveChanges();

            }

        }

    }

}

 

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

Output3.png
 

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

Output4.png
 

I hope this article was useful for you.

 

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