
424 Chapter 9 • Using ADO.NET
Table 9.2 Parameter Directions
Member Name Description
Input The parameter is an input parameter. This allows for data to
be passed into the command, but not out. We may have
more than one.
Output The parameter is an output parameter. It is used to return
variables, but cannot be used to pass data into a command.
The command must be written specifically to populate this
variable as part of its routine. We may have more than one.
InputOutput The parameter is capable of both input and output. It is used
when we need to pass data in to and out of a command in
one object. It does exactly as its name implies, it performs ...