Client Object Model Sharepoint 2010

We are using client object model in sharepoint 2010
When we excute the ExcuteQuery method of clinet obejct model we are getting following error
The security validation for this page is invalid. Click Back in your Web browser, refresh the page, and try your operation again
Girish

Hi ,
A FormDigest control has to be included to create a digest for security validations when performing some modifications to SharePoint data. It adds a security token inside your page based on user, site and time. Once the page is posted back the security token
is validated. Once the security token is generated it’s valid for a configurable amount of time. 
for more info check the below links
http://msdn.microsoft.com/en-us/library/microsoft.sharepoint.webcontrols.formdigest.aspx
http://ranaictiu-technicalblog.blogspot.com.au/2010/02/sharepoint-2010-client-object-model-for.html
if above link is not working, use below function before execute the query.
function CustomUpdateFormDigest()
if(window._spPageContextInfo != null)
var $v_2 = window._spPageContextInfo;
var $v_3 = $v_2.webServerRelativeUrl;
var $v_4 = window._spFormDigestRefreshInterval;
UpdateFormDigest($v_3, $v_4);
CustomUpdateFormDigest();
Please mark it as an answer/helpful if it is useful.
Thanks
Mahesh

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    "Server was unable to process request. ---> The server was unable to process the request due to an internal error. ...." in Visual Studio 2010.
    Following the Code Snip:
    ClientContext clientContext = new ClientContext("https://URI.sharepoint.com/");
    clientContext.AuthenticationMode = ClientAuthenticationMode.FormsAuthentication;
    clientContext.FormsAuthenticationLoginInfo = new FormsAuthenticationLoginInfo("USER", "PASS");
    Web web = clientContext.Web;
    ListCollection allLists = web.Lists;
    clientContext.Load(web);
    clientContext.Load(allLists);
    clientContext.ExecuteQuery();
    Console.WriteLine("{0} ({1})", web.Title, web.Description);
    foreach (List list in allLists)
    Console.WriteLine("{0} ({1})", list.Title, list.BaseType);

    Hi M.Litschke. You should have received a welcome email when you signed up for the Beta that had the community forum link & login details in it. Did you not recieve one?Myles Jeffery | Thinkscape |
    SharePoint Online Deployment |
    SharePoint Online File Migration Tool

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