The Like Method LINQ App to Select Data

Introduction

 

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

 

Question: What is the "Like" method?

 

In simple terms "It enables extracting data from a table based on the requested matching condition in SqlMethods".

 

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="LikeMethodLINQApp.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="LIKE Method 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="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" />

                                <EmptyDataTemplate>

                                    No Records Found!</EmptyDataTemplate>

                            </asp:GridView>

                        </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.Data.Linq.SqlClient;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

namespace LikeMethodLINQApp

{

    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.tblEmployees where SqlMethods.Like(r.FirstName, "R%") select r;

            GridView1.DataSource = query;

            GridView1.DataBind();

        }

        #region Instance MembersDataClasses1DataContext objContext = new DataClasses1DataContext();

        #endregion

    }

}
 

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

Output2.png
 

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

Output3.png
 

I hope this article was useful for you.

 

 

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