Why does .NET foreach loop throw NullRefException when collection is null?

Question

So I frequently run into this situation... where Do.Something(...) returns a null collection, like so:

int[] returnArray = Do.Something(...);
         


        

Answer 1

SPListItem item;
DataRow dr = datatable.NewRow();

dr["ID"] = (!Object.Equals(item["ID"], null)) ? item["ID"].ToString() : string.Empty;