Enhanced Delete Support in .NET 4.5

Introduction

Today, in this article let's play around with one of the interesting and most useful concepts in .NET 4.5.

Question: What is enhanced delete support?

In simple terms "It provides enhanced deleting support with various methods invocation as per the usage".

Step 1: Create a new "ASP.Net Web Forms Application", as in:

New-project-in-asp.net.jpg

Step 2: Create an Entity Data Model Framework and set it up with an appropriate database.

Step 3: The complete code of webform1.aspx looks like this:

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

<!DOCTYPE html>

</head>

<body>

<div>

<asp:GridView ID="GridView1" runat="server" BackColor="LightGoldenrodYellow" ItemType="EnhancedDeleteSupportApp.Employee"

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

AutoGenerateColumns="false" SelectMethod="GetData" UpdateMethod="UpdateData"

AutoGenerateEditButton="true" AutoGenerateDeleteButton="true" DeleteMethod="DeleteData">

</PagerStyle>

<asp:BoundField DataField="Id" HeaderText="ID" ReadOnly="true" />

<asp:BoundField DataField="FirstName" HeaderText="FirstName" SortExpression="FirstName" />

<asp:BoundField DataField="LastName" HeaderText="LastName" SortExpression="LastName" />

<asp:BoundField DataField="Age" HeaderText="Age" SortExpression="Age" />

</Columns>

</asp:GridView>

</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 EnhancedDeleteSupportApp

{

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

{

protected void Page_Load(object sender, EventArgs e)

{

}

public IQueryable GetData()

{

return objEntities.Employee;

}

public void UpdateData(Employee employee)

{

if (ModelState.IsValid)

{

objEntities.Entry(employee).State = System.Data.EntityState.Modified;

objEntities.SaveChanges();

}

public void DeleteData(int id)

{

Employee obj_Employee = objEntities.Employee.Find(id);

objEntities.Employee.Remove(obj_Employee);

objEntities.SaveChanges();

}

#region Instance VariablesCompanyEntities objEntities = new CompanyEntities();#endregion

}

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

Output-of-the-application-in-asp.net.jpg

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

Age-with-Output-of-the-application-in-asp.net.jpg

Step 7: The deleted data showing in database output of the application looks like this: