How to set people and group column programmatically using Client Object Model

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nusing SP = Microsoft.SharePoint.Client;
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using (SP.ClientContext _ctx = new SP.ClientContext("http://YourSiteUrl"))

n SP.ListItem _listItem = null;

n nctx.Credentials = CredentialCache.DefaultCredentials;

n SP.List _testList = web.Lists.GetByTitle(“TestList”);

n SP.CamlQuery _query = newnSP.CamlQuery();

  query.ViewXml = @"<View><Query><Where><Geq><FieldRef Name='ID'/>" + "<Value Type='Number'>10</Value></Geq></Where></Query></View>";

n SP.ListItemCollection _listitems =n_configList.GetItems(_query);

n nctx.Load(_listitems);

n nctx.ExecuteQuery();

n if (_listitems != nulln&& _listitems.Count > 0)

n {

n _listItemn= _listitems[0];

n SP.FieldUserValue _userValue = new SP.FieldUserValue();

n SP.User _newUser = _ctx.Web.EnsureUser(“domain\\username”);

n n_ctx.Load(_newUser);

n n_ctx.ExecuteQuery();

n _userValue.LookupIdn= _newUser.Id;

n n_listItem[“userfield”] =n_userValue;

n n_listItem.Update();

n n_ctx.ExecuteQuery();

n }

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