Q. How does Client object model works ?
Q. How many types of Client Object model extension are available in 2010 and when would you use one or the other.
Ans. To develop rich client side solutions, three set of client-side APIs has been introduced in the Microsoft.SharePoint.Client namespace. The three APIs are targeted for three different types of clients.
1. .net Managed applications – These are used when we have to create console applications or window applications, web applications which are not running inside SharePoint Contex.
2. For Silverlight applications
Q. What is difference between Load() and LoadQuery() methods ?
Ans. Load method populates the client object directly with what it gets data from the server i.e. a collection object like ListItemCollection etc. but LoadQuery returns the data as a completely new collection in IEnumerable format. Other major difference is that the Collections that you load using the Load() method are eligible for garbage collection only when the client context variable itself goes out of scope where as, in these collections go out of scope at the end of IEnumerable<List> list.
Q. How can you write efficient and better performing client object applications ?
Ans. You can always use Lambda expressions in your queries to return only specific properties that will be used in your block. You can also use LoadQuery() method and specify multiple levels of properties to load for e.g. while returning specific properties of the lists using LoadQuery(), you can also specify the fields to return from each list to optimize the data access.
Q. What are the Authentication methods for your client object model application ?
Ans. Basically there are three (3) authentication options you can use when you’re working with the Client Object Model in SharePoint 2010:
You can specify clientContext.Authentication = Anonymous\Default\FormsAuthentication, If you do not choose an authentication method in your code, the application will default to using the client’s Windows Credentials (DefaultCredentials). For more details see Authentication Setup in SharePoint 2010 Client object model
Q. How do you access ECMAScript object model API’s ?
Ans. The ECMAScript library is available in a number of JS files in the LAYOUTS folder. The main file among number of .js files is SP.js. When you include this file in the APSX page using a ScriptLink control, all other required JS files are loaded automatically. By linking SP.js to your page, the SP namespace gets registered. SP is the SharePoint namespace that contains all objects. For debugging purposes every js file also has a ‘debug’ equivalent in the same folder.
Q. What is the purpose of calling clientContext.ExecuteQuery() ?
Ans. ExecuteQuery gives you the option to minimize the number of roundtrips to the server from your client code. All the components loaded into the clientcontext are executed in one go.