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

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

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">

.grid

{

margin-top: 50px;

}

</style>

</head>

<body>

<div>

<table>

<tr>

<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>

<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>

<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:

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

I hope this article was useful for you.