You can't pass an anonymous type to a non generic function, unless the parameter type is object.
public void LogEmployees (object obj)
{
var list = obj as IEnumerable();
if (list == null)
return;
foreach (var item in list)
{
}
}
Anonymous types are intended for short term usage within a method.
From MSDN - Anonymous Types:
You cannot declare a field, a property, an event, or the return type of a method as having an anonymous type. Similarly, you cannot declare a formal parameter of a method, property, constructor, or indexer as having an anonymous type. To pass an anonymous type, or a collection that contains anonymous types, as an argument to a method, you can declare the parameter as type object. However, doing this defeats the purpose of strong typing.
(emphasis mine)
Update
You can use generics to achieve what you want:
public void LogEmployees<T>(IEnumerable<T> list)
{
foreach (T item in list)
{
}
}