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Q: Can I use LINQ to lists in sharepoint online? Can I use LINQ with lists in sharepoint online? If so, can someone provide me with an example?

A: Yes, you can use it in SharePoint online

SharePoint 2010 includes the LINQ to SharePoint provider, which
  translates LINQ statements to CAML queries. LINQ is a standard query
  language and, when applied to SharePoint, it enables developers to
  query SharePoint lists without requiring them to learn the CAML syntax
  that is used internally by SharePoint.

Source:
http://www.microsoft.com/download/en/details.aspx?id=17069

A: Yes, We can use LINQ in SharePoint Online. I used it in a Visual web part which stores the information from the form to the list. Here are the steps to follow:


*

*Create a ListContext File with the help of SPMetal

*Now use the ListCotext file as the entity layer for the data saving and modification functionality

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