Update Data With LINQ-to-SQL Via WCF Service

This article demonstrates an interesting and very useful concept in LINQ-to-SQL.

Introduction

This article demonstrates an interesting and very useful concept in LINQ-to-SQL.

Question: What is update data with LINQ-to-SQL via WCF service?

In simple terms "It provides flexibility to update data from the DB using LINQ-to-SQL context via WCF Service".

Step 1: Create a new web application

Output1.jpg

Step 2: Create a new WCF service application

Output2.jpg

Step 3: Adding a new LINQ-to-SQL

Output3.png

Output4.jpg

Output5.png

Step 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<tblEmployee> GetAllEmployees();

        [OperationContract]

        void UpdateEmployee(int a, string b, string c, int d);

    }

}

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{

        /// <summary>

        /// Gets all employees.

        /// </summary>

        /// <returns></returns>

        /// public List<tblEmployee> GetAllEmployees()

        /// {

        // TODO: Implement this methodvar query = from r in objContext.tblEmployees select r;

        return query.ToList();

    }

    /// <summary>

    /// Updates the employee.

    /// </summary>

    /// public void UpdateEmployee(int a, string b, string c, int d)

    /// {

    /// objContext.UpdateData(a, b, c, d);

    /// }

    /// #region Instance MembersDataClasses1DataContext objContext = new DataClasses1DataContext();

    /// #endregion

    /// }

}

Step 6: Adding a service reference:

Output6.png

Step 7: The complete code of WebForm1.aspx is as in the following:
 

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

    <title></title>

</head>

<body>

    <form id="form1" runat="server">

    <div>

        <center>

            <table>

                <tr>

                    <td>

                        <asp:Label ID="Label1" runat="server" Text="Update Date with LINQ-to-SQL using WCF"

                            Font-Bold="true"></asp:Label>

                    </td>

                </tr>

                <tr>

                    <td>

                        <asp:GridView ID="GridView1" runat="server" BackColor="#CCCCCC" AutoGenerateColumns="False"

                            BorderColor="#999999" BorderStyle="Solid" BorderWidth="3px" CellPadding="4" CellSpacing="2"

                            ForeColor="Black" OnLoad="Page_Load">

                            <FooterStyle BackColor="#CCCCCC" />

                            <HeaderStyle BackColor="Black" Font-Bold="True" ForeColor="White" />

                            <PagerStyle BackColor="#CCCCCC" ForeColor="Black" HorizontalAlign="Left" />

                            <RowStyle BackColor="White" />

                            <SelectedRowStyle BackColor="#000099" Font-Bold="True" ForeColor="White" />

                            <SortedAscendingCellStyle BackColor="#F1F1F1" />

                            <SortedAscendingHeaderStyle BackColor="#808080" />

                            <SortedDescendingCellStyle BackColor="#CAC9C9" />

                            <SortedDescendingHeaderStyle BackColor="#383838" />

                            <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>

            <br />

            <br />

            <table>

                <tr>

                    <td>

                        <asp:Label ID="Label6" runat="server" Text="Please Enter Id: " ForeColor="Brown"

                            Font-Bold="true" Font-Italic="true"></asp:Label>

                    </td>

                    <td>

                        <asp:TextBox ID="TextBox4" runat="server"></asp:TextBox>

                    </td>

                </tr>

                <tr>

                    <td>

                        <asp:Label ID="Label2" runat="server" Text="Please Enter FirstName: " ForeColor="Brown"

                            Font-Bold="true" Font-Italic="true"></asp:Label>

                    </td>

                    <td>

                        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>

                    </td>

                </tr>

                <tr>

                    <td>

                        <asp:Label ID="Label3" runat="server" Text="Please Enter LastName: " ForeColor="Brown"

                            Font-Bold="true" Font-Italic="true"></asp:Label>

                    </td>

                    <td>

                        <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>

                    </td>

                </tr>

                <tr>

                    <td>

                        <asp:Label ID="Label4" runat="server" Text="Please Enter Age: " ForeColor="Brown"

                            Font-Bold="true" Font-Italic="true"></asp:Label>

                    </td>

                    <td>

                        <asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>

                    </td>

                </tr>

                <tr>

                    <td colspan="2">

                        <asp:Button ID="Button1" runat="server" Text="Update Data" OnClick="Button1_Click"

                            BackColor="Orange" Font-Bold="true" /><br />

                        <br />

                    </td>

                </tr>

            </table>

            <br />

            <br />

            <table>

                <tr>

                    <td colspan="3">

                        <asp:Label ID="Label5" runat="server" ForeColor="Red" Font-Bold="true"></asp:Label>

                    </td>

                </tr>

            </table>

        </center>

    </div>

    </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 UpdateData_WCF_LINQtoSQL.ServiceReference1;namespace UpdateData_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)

        {

            if (string.IsNullOrEmpty(TextBox4.Text) || string.IsNullOrEmpty(TextBox1.Text) || string.IsNullOrEmpty(TextBox2.Text) || string.IsNullOrEmpty(TextBox3.Text))

            {

                Label5.Text = "Please Enter Some Values";

                Label5.ForeColor = System.Drawing.Color.Red;

            }

            else

            {

                objClient.UpdateEmployee(int.Parse(TextBox4.Text), TextBox1.Text, TextBox2.Text, int.Parse(TextBox3.Text));

                GridView1.DataSource = objClient.GetAllEmployees();

                GridView1.DataBind();

                Label5.Text = "Records Updated Successfully";

                Label5.ForeColor = System.Drawing.Color.Green;

                TextBox1.Text = string.Empty;

                TextBox2.Text = string.Empty;

                TextBox3.Text = string.Empty;

                TextBox4.Text = string.Empty;

            }

        }

        #region Instance MembersService1Client objClient = new Service1Client();

        #endregion

    }

}

Step 9: The output of the application is as in the following:

Output7.png


Step 10: The updated data output of the application is as in the following:


Output8.png



I hope this article was useful for you.