How to update data using class

Normally, I insert data like this for my web pages (VB.NET):

        cmd = New SqlCommand("Add_NewOrder", Conn)
        cmd.CommandType = CommandType.StoredProcedure
        Dim NewCateringOrderID As SqlParameter
        NewCateringOrderID = New SqlParameter("@NewCateringOrderID", SqlDbType.BigInt)
        NewCateringOrderID.Direction = ParameterDirection.Output
        cmd.Parameters.Add(NewCateringOrderID)

        ' pass customer info to stored proc
        cmd.Parameters.Add("@EventDate", txtEventDate.Text)
        cmd.Parameters.Add("@FirstName", txtFName.Text)

        cmd.ExecuteNonQuery()

I am taking a test for a job, and I am guessing they don't want m e to do it this way.  Is there a way to shove an insert into a class as a method then somehow use it to do the insert?  How would I pass parameters or create the right parameters though...meaning if I called the method by creating an instance of the class, how would it know which parameters to create if you wanted to reuse the method?

and what about an update method?