多个定义的结构可以放在一个类里面么？

Public Class IGlobeStru
    '地图信息结构
    Public Structure MapInfo
        Public stcdt As String   
        Public stnm As String     
        Public sttp As String     
        Public x As Double      
        Public y As Double      
     End Structure

    '河道旬月特征值表
    Public Structure ST_RVAV_R_STRU
        Public STCDT As String
        Public ymdhm As Date
        Public DAYS As String
        Public ZA As Single
        Public QA As Single
    End Structure

   等等同样是多个结构定义
End Class

以上是别人写的的项目中单独的一个vb类库。请问，里有类这一说法么？有类，那不是跟C#一样了？哎，总是把和c#搞混！请教大家！