33.2 Classes

C# uses the class statement along with opening and closing braces to indicate the beginning and end of a class definition. For example:

 public class DataException : SystemException {    // member definitions } 

In VB, a class definition is indicated by the Class ... End Class construct:

 Public Class DataException     Inherits SystemException    ' member definitions End Class 

In addition, C# classes can be marked as abstract or sealed ; these correspond to the VB MustInherit and NonInheritable keywords, as shown in Table 33-2.

Table 33-2. C# and equivalent VB class modifiers

C# keyword

VB keyword

abstract

MustInherit

sealed

NonInheritable

C# uses the colon to indicate either inheritance or interface implementation. Both the base class and the implemented interfaces are part of the class statement. For example:

 public class DataSet : MarshalByValueComponent, IListSource,    ISupportInitialize, ISerializable 

In VB, a base class and any implemented interfaces are specified on separate lines immediately following the Class statement. A class's base class is indicated by preceding its name with the Inherits keyword; any implemented interfaces are indicated by the Implements keyword. Hence, the previous definition of the DataSet class in C# would appear as follows in VB:

 Public Class DataSet    Inherits MarshalByValueComponent    Implements IListSource, ISupportInitalize, ISerializable 


ADO. NET in a Nutshell
ADO.NET in a Nutshell
ISBN: 0596003617
EAN: 2147483647
Year: 2005
Pages: 415

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