Truncate Table Using LINQ

Introduction

 

Today, in this article let's play around with an interesting and very useful concept in LINQ.

 

Question: What is truncating a table using LINQ?

 

In simple terms "It deletes all the data from a table based on the requested entity query".

 

Step 1: Create a new web application


Output1.jpg
 

Step 2: The complete code of WebForm1.aspx looks like this:

 

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

    <div>

        <center>

            <div>

                <table>

                    <tr>

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

                            <asp:Label ID="Label1" runat="server" Text="Truncate Table LINQ App - Select Data"

                                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="Truncate Table Data" Font-Names="Verdana"

                                Width="213px" BackColor="Orange" Font-Bold="True" OnClick="Button1_Click" />

                        </td>

                    </tr>

                </table>

            </div>

        </center>

    </div>

    </form>

</body>

</html>


Step 3:
 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 Truncate_Table_LINQ_App

{

    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 objContext.Persons select r;

            objContext.Persons.DeleteAllOnSubmit(query);

            objContext.SubmitChanges();

        }

        #region Instance MembersDataClasses1DataContext objContext = new DataClasses1DataContext();

        #endregion

    }

}


Step 4:
 The output of the application looks like this:
 

Output2.png

I hope this article was useful for you.

 

Up Next
    Ebook Download
    View all
    Learn
    View all
    MVC Corporation is consulting and IT services based company.