I keep getting a strange error when I try loop through excel's cells and find one with cotaining no data. I get an unhandled exception of type 'System.Runtime.InteropServices.COMexception'.... Exception from HRESULT: 0x800A03EC. My code is as follows

D
I +=
If mExcel.Range("A5").Text = " " The
....do somethin
Loop While MyExcel.Range(strBoth).Value < "

The if statement is the line causing the error. I've tried multiple vartions of the loop. I've refrenced the COM microsoft excel 10.0 and am running Office XP pro. I also included Imports Microsoft.Office.Core. Thanks for any help. Any useful links/examples would also be greatly appreciated.

PS I've mananged to make it through the if statmet a few times but I 've also been getting various cast exception errors regarding mscorlib.dll.