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");
ListItemCollection listItems = list.GetItems(new CamlQuery() { ViewXml = "<View/>" });
context.Load(listItems);
context.ExecuteQuery();

listItems[listItems.Count - 1].DeleteObject();
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();

var context = new SP.ClientContext.get_current();
var web = context.get_web();

web.set_masterUrl('/sites/intranet2/_catalogs/masterpage/oslo.master');
web.set_siteLogoUrl('/sites/intranet2/Style%20Library/images/Contoso-Blue.png');
web.set_alternateCssUrl('/sites/intranet2/Style%20Library/CSS/Contoso.Intranet3.css');

web.update();
context.executeQueryAsync(onQuerySucceeded, onQueryFailed);

string str="Peakfinder";
string strlist="Employee";
Web web = context.Site.OpenWebById(str); 
List list = web.Lists.GetByTitle(strlist);
string queryTxt = "<View><Query><Where><Contains><FieldRef Name=\"Title\" /><Value Type=\"Text\">Auto</Value></Contains></Where></Query></View>"; 
CamlQuery query = new CamlQuery(); 
query.ViewXml = queryTxt;
ListItemCollection listItems = list.GetItems(query);

context.Load(listItems, items => items.Include(item => item.Id,item => item["Title"], item => item["Name"], item => item["Design"])); 
context.ExecuteQuery();

foreach (ListItem item in listItems) 
{
Console.WriteLine("Item ID = " + item.Id + " Title = " + item["Title"] + " helloworld= " + item["Name"] + " myField= " + item["Design"]);
} 

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];

ExecuteOrDelayUntilScriptLoaded(init,"sp.js");
var currentUser;

function init(){
 this.clientContext = new SP.ClientContext.get_current();
 this.oWeb = clientContext.get_web();
 currentUser = this.oWeb.get_currentUser();
 this.clientContext.load(currentUser);
 this.clientContext.executeQueryAsync(Function.createDelegate(this,this.onQuerySucceeded), Function.createDelegate(this,this.onQueryFailed));
}
function onQuerySucceeded() {
 document.getElementById("currentUser").innerHTML = currentUser.get_loginName();
}
function onQueryFailed(sender, args) {
 alert('Request failed. \nError: ' + args.get_message() + '\nStackTrace: ' + args.get_stackTrace());
}
</script>
<div>Current Logged-In User:<label id="currentUser"></label></div>