SPMetal LINQ - To SharePoint Update 2010 Programmatically Using VS 2010

Introduction

Today, in this article let's play around with one of the interesting and most useful concepts in SharePoint 2010.

Question: What is a SPMetal LINQ to SharePoint Update?

In simple terms "It enables creation of a DataContext object using SPMetal, by which we can update the data of a custom list with the help of a LINQ query".

I think we are now good to go and implement this wonderful concept.

Step 1 : Open the command prompt as an administrator and enter the following command by requesting a specific site:

Spmetal.exe /web:http://win-5d57sl2rvt1:9107/ /code:C:\Student.cs

After you have run this, the Student.cs file will be created in the C: Drive of your system directories.

Step 2 : Open SharePoint 2010 central administration and navigate to specific site.

Step 3 : Open up Visual Studio 2010 and create an empty SharePoint project.



Step 4 : Select "Deploy as a farm solution" and click the next button. Now an empty project will be created.



Step 5 : Add a new visual webpart for that project. Also add the Student.cs file into the project.


Step 6 : The complete code of visualwebpart1usercontrol.ascx looks like this:

<%@ Assembly Name="$SharePoint.Project.AssemblyFullName$" %>
<%@ Assembly Name="Microsoft.Web.CommandUI, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>
<%@ Register TagPrefix="SharePoint" Namespace="Microsoft.SharePoint.WebControls"
    Assembly="Microsoft.SharePoint, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>
<%@ Register TagPrefix="Utilities" Namespace="Microsoft.SharePoint.Utilities" Assembly="Microsoft.SharePoint, Version=14.0.0.0, Culture=neutral,
PublicKeyToken=71e9bce111e9429c" %>
<%@ Register TagPrefix="asp" Namespace="System.Web.UI" Assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral,
PublicKeyToken=31bf3856ad364e35" %>
<%@ Import Namespace="Microsoft.SharePoint" %>
<%@ Register TagPrefix="WebPartPages" Namespace="Microsoft.SharePoint.WebPartPages"
    Assembly="Microsoft.SharePoint, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>
<%@  Control Language="C#" AutoEventWireup="true" CodeBehind="SPMetalUpdateWPUserControl.ascx.cs"
    Inherits="SPMetalUpdateApp.SPMetalUpdateWP.SPMetalUpdateWPUserControl" %>
<center>
    <div>
        <table>
            <tr>
                <td colspan="2">
                    <asp:label id="Label1" runat="server" text="LINQ-TO-SharePoint Update - SharePoint 2010 Programatically"
                        font-bold="true" font-size="Large" font-names="Verdana" forecolor="Maroon"></asp:label>
                </td>
            </tr>
            <tr>
                <td>
                    <asp:label id="Label7" runat="server" text="Please Enter ID" font-size="Large" font-names="Verdana"
                        font-italic="true"></asp:label>
                </td>
                <td>
                    <asp:textbox id="TextBox1" runat="server" width="117px"></asp:textbox>
                </td>
            </tr>
            <tr>
                <td>
                    <asp:label id="Label2" runat="server" text="Please Enter First Name" font-size="Large"
                        font-names="Verdana" font-italic="true"></asp:label>
                </td>
                <td>
                    <asp:textbox id="TextBox2" runat="server" width="117px"></asp:textbox>
                </td>
            </tr>
            <tr>
                <td>
                    <asp:label id="Label3" runat="server" text="Please Enter Last Name" font-size="Large"
                        font-names="Verdana" font-italic="true"></asp:label>
                </td>
                <td>
                    <asp:textbox id="TextBox3" runat="server" width="117px"></asp:textbox>
                </td>
            </tr>
            <tr>
                <td>
                    <asp:label id="Label4" runat="server" text="Please Enter Gender" font-size="Large"
                        font-names="Verdana" font-italic="true"></asp:label>
                </td>
                <td>
                    <asp:dropdownlist id="DropDownList1" runat="server" style="margin-left: 0px" width="117px"><asp:ListItem Text="Male"
Value="1"></asp:ListItem><asp:ListItem Text="Female" Value="2"></asp:ListItem></asp:dropdownlist>
                </td>
            </tr>
            <tr>
                <td>
                    <asp:label id="Label6" runat="server" text="Please Enter Age" font-size="Large" font-names="Verdana"
                        font-italic="true"></asp:label>
                </td>
                <td>
                    <asp:textbox id="TextBox4" runat="server" width="117px"></asp:textbox>
                </td>
            </tr>
            <tr>
                <td colspan="2">
                    <br />
                    <asp:button id="Button1" runat="server" text="Update Data" font-names="Verdana" width="282px"
                        backcolor="Orange" font-bold="True" onclick="Button1_Click" />
                </td>
            </tr>
            <tr>
                <td colspan="2">
                    <br />
                    <asp:label id="Label5" runat="server" font-bold="true" font-names="Verdana"></asp:label>
                </td>
            </tr>
        </table>
    </div>
</center>

Step 7 : The complete code of visualwebpart1usercontrol.ascx.cs looks like this:

using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using Microsoft.SharePoint.Linq;
using System.Linq;
using WebApplication2;
namespace SPMetalUpdateApp.SPMetalUpdateWP
{
    public partial class SPMetalUpdateWPUserControl : UserControl
    {
        protected void Page_Load(object sender, EventArgs e)
        {
        }
        protected void Button1_Click(object sender, EventArgs e)
        {
            if (string.IsNullOrEmpty(TextBox1.Text) || string.IsNullOrEmpty(TextBox2.Text) || string.IsNullOrEmpty(TextBox3.Text) || string.IsNullOrEmpt
(TextBox4.Text))
            {
                Label5.Text = "Please Enter Some Values";
                Label5.ForeColor = System.Drawing.Color.Red;
            }
            else
            {
                StudentDataContext dataContext = new StudentDataContext("http://win-5d57sl2rvt1:9107/");
                var update = (from r in dataContext.PersonList where r.Id == int.Parse(TextBox1.Text) select r).First();
                update.Title = TextBox2.Text;
                update.LastName = TextBox3.Text;
                update.Age = int.Parse(TextBox4.Text);
                update.Gender = DropDownList1.SelectedItem.Text;
                dataContext.SubmitChanges();
                Label5.Text = "Data Successfully Updated";
                Label5.ForeColor = System.Drawing.Color.Green;
                TextBox1.Text = string.Empty;
                TextBox2.Text = string.Empty;
                TextBox3.Text = string.Empty;
                TextBox4.Text = string.Empty;
            }
        }
    }
}

Step 8 : Deploy the solution file and add the created webpart to SharePoint site.

Step 9 : The output of the person list looks like this:



Step 10 : The output of the application looks like this:



Step 11 : The output of the data updating application looks like this:



Step 12 : The output of the data updated in person list looks like this:



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