LINQToExcel Namespace Trouble

Hi all,
I am trying to use LINQ to Excel. When writing the line
"var SID = from p in excel.Worksheet()"
the system gives me back the following error "The type or namespace name 'SourceId' could not be found (Press F4 to check imported namespaces)." Can anybody help me with what has to be done in order for my query to be correct? According to some tutorial i have already seen the class SourceId should be first defined? Is that correct and even possible in LINQPad?
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