ARTICLE

Select and Delete Data Using LINQ With WCF

Posted by Vijay Prativadi Articles | LINQ November 10, 2012
Today, in this article let's play around with Select and Delete Data concept in LINQ.
Reader Level:

Introduction

Question: What is select data using LINQ with WCF?

In simple terms "It enables selection of data using LINQ queries via WCF Service".

Step 1: Create a new webform project

Output1.png

Step 2: The complete code of webform1.aspx looks like this:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WCFAppusingLINQ.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 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 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;
using WCFAppusingLINQ.ServiceReference1;
namespace WCFAppusingLINQ
{
    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 4: Create a new "WCF Service Application" project, as in:

Output1.1.png

Step 5: The complete code of IService1.cs looks like this:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.ServiceModel.Web;
using System.Text;
namespace WCFLINQ
{
    // 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 6: The complete code of Service1.svc.cs looks like this:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.ServiceModel.Web;
using System.Text;
namespace WCFLINQ
{
    // 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 objEntities.Employee select r);
            return query.ToList();
        }
        #region Instance MembersCompanyEntities objEntities = new CompanyEntities();
        #endregion
    }
}


Step 7: The output of the application looks like this:

Output2.png

Step 8: The output of the data retrieved output operation result looks like this:

Output3.png

Question: What is deleting data using LINQ with WCF?

In simple terms "It enables deletion of data using LINQ queries via a WCF Service".

Step 1: Create a new webform project

Step 2: The complete code of webform1.aspx looks like this:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WCFDeleteUsingLINQApp.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="Delete Data using LINQ with WCF" 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>
                    <td colspan="2" align="center">
                        <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>
                    <td colspan="2" align="center">
                        <asp:GridView ID="GridView1" runat="server" CssClass="grid" BackColor="LightGoldenrodYellow"
                            BorderColor="Tan" BorderWidth="1px" CellPadding="2" AutoGenerateColumns="false"
                            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" />
                            <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>
                <tr>
                    <td colspan="2" align="center">
                        <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 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;
using WCFDeleteUsingLINQApp.ServiceReference1;
namespace WCFDeleteUsingLINQApp
{
    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
            {
                objClient.DeleteEmpData(int.Parse(TextBox1.Text));
                GridView1.DataSource = objClient.GetAllEmployees();
                GridView1.DataBind();
                Label3.Text = "Records Deleted Successfully";
                Label3.ForeColor = System.Drawing.Color.Green;T
                    extBox1.Text = string.Empty;
            }       
        }
        #region Instance MembersService1Client objClient = new Service1Client();
        #endregion
    }
}

Step 4: Create a new "WCF Service Application" project.

Step 5: The complete code of IService1.cs looks like this:

using System;
using System.Collections.Generic;
using
System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.ServiceModel.Web;
using System.Text;
namespace WCFLINQDelete
{
    // 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();
        [OperationContract]
        void DeleteEmpData(int a);
    }
}


Step 6: The complete code of Service1.svc.cs looks like this:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.ServiceModel.Web;
using System.Text;
namespace WCFLINQDelete
{
    // 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 objEntities.Employee select r;
            return query.ToList();
        }
        public void DeleteEmpData(int a)
        {
            objEntities.DeleteEmployeeData(a);
        }
        #region Instance MembersCompanyEntities objEntities = new CompanyEntities();
        #endregion
    }
}


Step 7: The output of the application looks like this:

Output2 (1).png

Step 8: The output of the data deleted output operation result looks like this:

Output3 (1).png

I hope this article is useful for you.. I look forward for your comments and feedback.. Thanks Vijay Prativadi

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