WPF Simple Max Record Function in ObservableCollection

I have a DataGrid with a list of records. I'm using an ObservableCollection bind the Datagrid. All I need is a function/formula to return the (1)max value of the specified field (col1) ; and (2) a secondary value in the same row (col2) where the max value was founded. Here is the sample code of how I find a maximum value: int maxValue = ([login to view URL] as ObservableCollection<[login to view URL]>).Max(m => [login to view URL]) The above code will return only the max value...I need to get the maximum value + a secondary col. Ex. MAX RPM = 10,000 @ 12s (col2). any questions, please ask.