IntroductionThis article demonstrates an interesting and very useful concept in LINQ-to-SQL.Question: What is select data with LINQ-to-SQL via WCF service?In simple terms "It provides flexibility in the selection of data from a DB using LINQ-to-SQL context via WCF Service".Step 1: Create a new web applicationStep 2: Create a new WCF service applicationStep 3: Adding a new LINQ-to-SQLStep 4: The complete code of IService1.cs is as in the following:using System;using System.Collections.Generic;using System.Linq;using System.Runtime.Serialization;using System.ServiceModel;using System.ServiceModel.Web;using System.Text;namespace WCFServiceApp{ // NOTE: You can use the "Rename" command on the "Refactor" menu to change the interface name "IService1" //in both code and config file together. [ServiceContract] public interface IService1 { [OperationContract]List<Employee> GetAllEmployees(); }}Step 5: The complete code of Service1.svc.cs is as in the following:using System;using System.Collections.Generic;using System.Linq;using System.Runtime.Serialization;using System.ServiceModel;using System.ServiceModel.Web;using System.Text;namespace WCFServiceApp{ // NOTE: You can use the "Rename" command on the "Refactor" menu to change the class name "Service1" //in code, svc and config file together. public class Service1 : IService1 { public List<Employee> GetAllEmployees() { var query = (from r in objContext.Employees select r); return query.ToList(); } #region Instance MembersDataClasses1DataContext objContext = new DataClasses1DataContext(); #endregion }}Step 6: Adding a service referenceStep 7: The complete code of WebForm1.aspx is as in the following:<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="SelectData_WCF_LINQtoSQL.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="Select Data with LINQ-to-SQL using WCF" 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" AutoGenerateColumns="False"> <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" /> <Columns> <asp:BoundField DataField="EmpId" HeaderText="Id" /> <asp:BoundField DataField="FirstName" HeaderText="FirstName" /> <asp:BoundField DataField="LastName" HeaderText="LastName" /> <asp:BoundField DataField="Age" HeaderText="Age" /> </Columns> </asp:GridView> </td> </tr> </table> </div> </center> </form></body></html>Step 8: The complete code of WebForm1.aspx.cs is as in the following:using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;using SelectData_WCF_LINQtoSQL.ServiceReference1;namespace SelectData_WCF_LINQtoSQL{ public partial class WebForm1 : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e){} protected void Button1_Click(object sender, EventArgs e) { GridView1.DataSource = objClient.GetAllEmployees(); GridView1.DataBind(); } #region Instance MembersService1Client objClient = new Service1Client(); #endregion }}Step 9: The output of the application is as in the following:Step 10: The selected data output of the application is as in the following:I hope this article was useful for you.
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