How can I read the value of a cell in Excel?

Question

Hello
Can someone show me how to read a value from a cell in Excel?
Example:
Cell A1 has the text "TRUE"......how do I read this value back?
I am using Excel Interop...so far I have tried these statements, but with no success
excelapp.range["A1:A1"].value
excelapp.range["A1:A1"].ToString()
 
thanks
J