Server Object Model?
SharePoint server where the Server Object Model binaries

Example

inside Web Parts / Workflows.

Client Object Model?

client machines where the entire SharePoint binaries are not available.

Example
Windows Forms application in a client machine.

"Client" in the namespace.  For example, in the server object model you have:
Microsoft.SharePoint.SPSite
Microsoft.SharePoint.SPWeb
Microsoft.SharePoint.SPList

In the client object model you have:
Microsoft.SharePoint.Client.Site
Microsoft.SharePoint.Client.Web
Microsoft.SharePoint.Client.List


NameSpace:


Microsoft.SharePoint.Client.dll
Microsoft.SharePoint.Client.Runtime.dll


Example Code:

ClientContext context = new ClientContext("http://peakfinders.com");

Web web = context.Web;

List list = web.Lists.GetByTitle("yourlistname");

CamlQuery query = new CamlQuery();
query.ViewXml = "<View/>";

ListItemCollection listItems = list.GetItems(query);

context.Load(listItems);

context.ExecuteQuery();

ListItem item = listItems[listItems.Count - 1];
item["Status"] = "Complete";
item.Update();

context.ExecuteQuery();

"Client" in the namespace.  For example, in the server object model you have:
Microsoft.SharePoint.SPSite
Microsoft.SharePoint.SPWeb
Microsoft.SharePoint.SPList

In the client object model you have:
Microsoft.SharePoint.Client.Site
Microsoft.SharePoint.Client.Web
Microsoft.SharePoint.Client.List


NameSpace:


Microsoft.SharePoint.Client.dll
Microsoft.SharePoint.Client.Runtime.dll


Example Code:

ClientContext context = new ClientContext("http://peakfinders.com");

Web web = context.Web;

List list = web.Lists.GetByTitle("yourlistname");

ListItemCreationInformation newItem = new ListItemCreationInformation();
ListItem listItem = list.AddItem(newItem);
listItem["Title"] = "Peakfinder";
listItem.Update();

context.ExecuteQuery();

"Client" in the namespace.  For example, in the server object model you have:
Microsoft.SharePoint.SPSite
Microsoft.SharePoint.SPWeb
Microsoft.SharePoint.SPList

In the client object model you have:
Microsoft.SharePoint.Client.Site
Microsoft.SharePoint.Client.Web
Microsoft.SharePoint.Client.List


NameSpace:


Microsoft.SharePoint.Client.dll
Microsoft.SharePoint.Client.Runtime.dll


Example Code:

ClientContext context = new ClientContext("http://peakfinders.com");
List list = context.Web.Lists.GetByTitle("yourlistname");
CamlQuery query = new CamlQuery();
query.ViewXml = @"<View>
    <Query>
        <Where>
        <Eq>
            <FieldRef Name='Status'/>
            <Value Type='Text'>Pending</Value>
        </Eq>
        </Where>
    </Query>
    </View>";

ListItemCollection listItems = list.GetItems(query);
context.Load(listItems, items => items.Include(
                                                item => item["Name"],
                                                item => item["Designation"],
                                                item => item["Status"]
                                                ));
context.ExecuteQuery();

“Client” in the namespace.  For example, in the server object model you have:

• Microsoft.SharePoint.SPSite
• Microsoft.SharePoint.SPWeb
• Microsoft.SharePoint.SPList

In the client object model you have:

• Microsoft.SharePoint.Client.Site
• Microsoft.SharePoint.Client.Web
• Microsoft.SharePoint.Client.List

NameSpace:


Microsoft.SharePoint.Client.dll
Microsoft.SharePoint.Client.Runtime.dll


Example Code:

ClientContext context = new ClientContext("http://peakfinders.com");
List list = context.Web.Lists.GetByTitle("yourlistname");
CamlQuery query = new CamlQuery();
query.ViewXml = "<View><RowLimit>3</RowLimit></View>";

ListItemCollection listItems = list.GetItems(query);

context.Load(listItems);
context.ExecuteQuery();
context.ExecuteQuery();

“Client” in the namespace.  For example, in the server object model you have:
·         Microsoft.SharePoint.SPSite
·         Microsoft.SharePoint.SPWeb
·         Microsoft.SharePoint.SPList
In the client object model you have:
·         Microsoft.SharePoint.Client.Site
·         Microsoft.SharePoint.Client.Web
     ·         Microsoft.SharePoint.Client.List

NameSpace:


Microsoft.SharePoint.Client.dll
Microsoft.SharePoint.Client.Runtime.dll


Example Code:

ClientContext context = new ClientContext("http://peakfinders.com");
List list = context.Web.Lists.GetByTitle("yourlistname");
CamlQuery query = new CamlQuery();
query.ViewXml = "<View/>";
ListItemCollection items = list.GetItems(query);

context.Load(items);

context.ExecuteQuery();

foreach(ListItem item in items)
    if ((item.Id % 2) == 0)
    {
        item["Title"] += "**";
        item.Update();
    }

context.ExecuteQuery();

     ·         Microsoft.SharePoint.Client.List

NameSpace:


Microsoft.SharePoint.Client.dll
Microsoft.SharePoint.Client.Runtime.dll


Example Code:

ClientContext context = new ClientContext("http://peakfinders.com");
List list = context.Web.Lists.GetByTitle("yourlistname");
CamlQuery query = new CamlQuery();
query.ViewXml = "<View/>";
ListItemCollection items = list.GetItems(query);

context.Load(list);
context.Load(items);

context.ExecuteQuery();

1;#Deepak Kumar


Get User name:

new SPFieldLookupValue(properties.ListItem["Staff Member"].ToString()).LookupValue;


Get User ID:

new SPFieldLookupValue(properties.ListItem["Staff Member"].ToString()).LookupId;

Using Split fuction:

properties.ListItem["Staff Member"].ToString();

You are going to be returned their userID and username, so it will always be returned separated by ;#.



properties.ListItem["Staff Member"].ToString().split(";#")[1];

we have to add this reference

Microsoft.SharePoint.Client
Microsoft.SharePoint.Client.Runtime

ClientContext context = new ClientContext("http://peakfinders");

Web web = context.Web;

List list = web.Lists.GetByTitle(“Users”);

CamlQuery caml=new CamlQuery();

ListItemCollection items = list.GetItems(caml);

context.Load<List>(list
context.Load<ListItemCollection>(items
context.ExecuteQuery();

foreach (Microsoft.SharePoint.Client.ListItem item in items)

{

Console.WriteLine(item.FieldValues["Title"]);

}

Console.ReadLine();

ClientContext context = new ClientContext("http://SiteUrl"); 

SP.List list = context.Web.GetCatalog(ListTemplateType.WebPartCatalog); 
BasePermissions perm = new BasePermissions(); 
perm.Set(PermissionKind.ManageLists); 

ConditionalScope scope = 
    new ConditionalScope(context, 
                         () => list.ServerObjectIsNull && context.Web.DoesUserHavePermissions(perm).Value); 
using (scope.StartScope()) 
{ 
    context.Load(list, l => l.Title); 
} 
context.ExecuteQuery(); 

label1.Text = scope.TestResult.Value; 

if (scope.TestResult.Value) 
{ 
    label1.Text = list.Title; 
}  

Please follow below steps in SharePoint Client object Model Development:

• ClientContext.ExecuteQuery before accessing any value properties
• Don't use value objects returned from methods or properties in the same query.
• When we methods or properties that return client objects in another method call in the same query
• Group data retrieval on the same object together to improve performance
• Specify which properties of objects you want to return
• conditional scope to test for preconditions before loading data
• Use an exception handling scope to catch exceptions

//Get the lists

ClientContext clientContext = new ClientContext(_siteurl);
clientContext.AuthenticationMode =ClientAuthenticationMode.Default;
clientContext.Credentials = new System.Net.NetworkCredential(“peakfinders”, “password@1”, “peakfinders”);
Web oweb = clientContext.Web;
            List myList = oweb .Lists.GetByTitle("Employee");

            roles = oweb.LoadQuery(
            myList.RoleAssignments.Include(
            roleAssign => roleAssign.Member,
            roleAssign=> roleAssign.RoleDefinitionBindings.Include(
            roleDefine => roleDefine.Name, // for each role def, include roleDef’s Name
            roleDefine=> roleDefine.Description,
            roleDefine=> roleDefine.RoleTypeKind,
            roleDefine=> roleDefine.BasePermissions)));
            clientContext.ExecuteQuery();

            Dictionary dicpermission= new Dictionary();

            foreach (RoleAssignment ra in roles)
            {
                var rdc = ra.RoleDefinitionBindings;
                string permission = string.Empty;
                foreach (var strrp in rdc)
                {
                    permission += strrp.Name.ToString() +","+ strrp.Description.ToString() +","+ strrp.RoleTypeKind.ToString()+","+ strrp.BasePermissions.ToString();                  
                }
                dicpermission.Add(ra.Member.Title, permission);

static string mainpath = "http://peakfinders/";
        static void Main(string[] args)
        {

            subsite(mainpath);
         
        }

        public static  void  subsite(string path)
        {
        
            try
            {
                ClientContext clientContext = new ClientContext( path );
                Web osweb = clientContext.Web;
                clientContext.Load(osweb, website => website.Webs, website => website.Title);
                clientContext.ExecuteQuery();
                foreach (Web oweb in osweb.Webs)
                {
                    string newpath = mainpath + oweb.ServerRelativeUrl;
                    getSubWebs(newpath);
                    Console.WriteLine(newpath + "\n" + oweb.Title );
   Console.ReadLine();
                }
            }
            catch (Exception ex)
            {
              
            }
        
         
        }

Solution Explorer, right-click on the "References" folder and then click on "Add Reference"

We have to add ddl:
Microsoft.SharePoint.Client.dll
Microsoft.SharePoint.Client.Runtime.dll
Microsoft.SharePoint.Client.UserProfiles.dll

Namespace:

using Microsoft.SharePoint.Client;
using Microsoft.SharePoint.Client.UserProfiles;
Coding:

string siteUserName="nam";
string _siteurl="http://sharepoint.com";
string _sitepassword ="pass@word1";
string accountName ="raghupc\raghu";
ClientContext clientContext = new ClientContext(_siteurl);
clientContext.AuthenticationMode =ClientAuthenticationMode.Default;
clientContext.Credentials = new System.Net.NetworkCredential(_siteUserName, _sitepassword, _domainName);
Web oweb = clientContext.Web;
clientContext.ExecuteQuery();
PeopleManager peopleMang = new PeopleManager(clientContext);
PersonProperties personProp = peopleMang.GetPropertiesFor(accountName);
clientContext.Load(personProp, p => p.AccountName, p => p.Email, p => p.DisplayName);
clientContext.ExecuteQuery();
Label1.Text= personProp.AccountName;
Label2.Text= personProp.Email;
Label3.Text =personProp.DisplayName;

SharePoint client object model used to retrieve, update, and manage data in SharePoint 2013.


Types:
1.Server Object Model
2.Client Object Model
3.Javascript Library
4.Rest Service/OData Library

Loads the SP.Runtime.js and SP.js files by using the getScript function in jQuery.


Title – SP.ListItem.get_item('Title');

ID – SP.ListItem.get_id();

Url -SP.ListItem.get_item('urlfieldname').get_url()

Description – SP.ListItem.get_item('descriptionfieldname').get_description();

Current Version – SP.ListItem.get_item("_UIVersionString");

Lookup field – SP.ListItem.get_item('LookupFieldName’).get_lookupValue(); // or get_lookupID();

Created By – SP.ListItem.get_item("Author").get_lookupValue();

Modified by – SP.ListItem.get_item("Editor").get_lookupValue();

Choice Field – SP.ListItem.get_item('ChoiceFieldcolumnName');

Created Date – SP.ListItem.get_item("Created");

Modified Date – SP.ListItem.get_item("Modified"); -> case sensitive does not work with 'modified’

File  – SP.ListItem.get_file();

File Versions -  File.get_versions();.

Content Type – SP.ListItem.get_contentType();

Parent List – SP.ListItem.get_parentList();

Note:  ('LookupFieldName’).get_lookupValue() sometimes returns an array of data, especially when your lookup allows multiple values.
For this,you will need to iterate the array and get each value individually.

 SP.ListItem.get_item('LookupFieldName’)[0].get_lookupValue();

For Arrays:


       for(var i = 0; i < oListItem.get_item("LookupFieldName").length; i++)
 {
      alert(oListItem.get_item("LookupFieldName")[i].get_lookupId()); // or get_lookupValue()
 }