## cannot be indexed because it has no default proper

I usually work from a computer in my office that has the .net sdk v1 installed. The application was working until I tried to compile my dll from here at home. Its the same code I downloaded it via ftp its just compiling differently. Both computers have the same compiler version. And the webserver as well. But whenever I compile from this machine it says...<BR><BR>BC30367: Class &#039;System.Data.DataSet&#039; cannot be indexed because it has no default property.<BR><BR>Its a compilation error not a runtime error. Same code compiled on the machine in my office does not produce the error.