Retrieve items from a SharePoint list using Client Side Object Model

// Starting with ClientContext, the constructor requires a URL to the 
// server running SharePoint. 
ClientContext context = new ClientContext("http://SiteUrl"); 

// Assume the web has a list named "Announcements". 
List announcementsList = context.Web.Lists.GetByTitle("Announcements"); 

// This creates a CamlQuery that has a RowLimit of 100, and also specifies Scope="RecursiveAll" 
// so that it grabs all list items, regardless of the folder they are in. 
CamlQuery query = CamlQuery.CreateAllItemsQuery(100); 
ListItemCollection items = announcementsList.GetItems(query); 

// Retrieve all items in the ListItemCollection from List.GetItems(Query). 
context.Load(items); 
context.ExecuteQuery(); 
foreach (ListItem listItem in items) 
{ 
    // We have all the list item data. For example, Title. 
    label1.Text = label1.Text + ", " + listItem["Title"]; 
}