I am writing a C# application which reads data from an Excel workbook and writes the process result back to another Excel workbook.  Currently I am using a one-cell range object to locate one cell by row & col id for each read and write. (i.e. everytime, I use the range object to refer to one cell and operates on its Value2 property)

Effectively I guess for each read and/or write, it creates a new Range object(???) and issue a COM call

Therefore I wonder is there any easier way to block read / write.  For example, is there a way to issue a command say "Read all the cells in a range (e.g. 1000 x 100) and return their Value2 in a collection-type object"?  (Unfortunately I don't have the control of the sorce Excel workbook, so cannot create named range in that workbook.