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.