Update Data With LINQ-to-SQL Via WCF Service

Vijay Prativadi
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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

Step 2: Create a new WCF service application

Step 3: Adding a new LINQ-to-SQL

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:

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">

</head>

<body>

<div>

<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">

<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 />

<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>

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

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

<br />

</td>

</tr>

</table>

<br />

<table>

<tr>

<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:

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

I hope this article was useful for you.

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