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convert List<List<object>> to IList<IList<object>>
IList<IList<object>> ret = new List<IList<object>>();

// Or whatever
ret.Add(new List<object>());

IList<IList<object>> p = new List<List<object>>();

List<List<object>> listOfLists = new List<List<object>>();
IList<IList<object>> p = listOfLists;
p.Add(new object[]);
List<object> list = p[0];

var myOriginalList = new List<List<Object>>();
var converted = ((IList<IList<Object>>)myOriginalList.Cast<IList<Object>>().ToList()); // EDIT: Added .ToList() here

IList<IList<object>> list = new List<IList<object>>(); // Works!

static IList<IList<object>> Test()
    {
        IList<IList<object>> result = new List<IList<object>>();
        var item = new List<object>() { "one", "two", "three" };
        result.Add(item);
        return result;
    }

public IList<IList<object>> Fetch(string data)
{
  IList<IList<object>> p = new List<IList<object>>();

  // add your stuff here

  return p;
}

List<List<string>> list = new List<IList<string>>(); // DOES NOT COMPILE!!!!!