这样的位定义，VB.NET能实现吗？解决思路

这样的位定义，VB.NET能实现吗？
在VC中有这样的位定义

struct PP
{
  unsigned i:4;
  unsigned j:12;
};


VB.NET能实现这样的位定义吗？即一个16位的unsigned short int 整数，可以取其前4位为i,后12位为j。

[解决办法]
难道是要这种效果

VB.NET code

Structure PP    Private ij As UShort    Public Property i() As UShort        Get            Return (ij And &HF000US) >> 12        End Get        Set(ByVal value As UShort)            ij = (value << 12US) Or (ij And &HFFFUS)        End Set    End Property    Public Property j() As UShort        Get            Return ij And &HFFFUS        End Get        Set(ByVal value As UShort)            ij = (ij And &HF000US) Or (value And &HFFFUS)        End Set    End PropertyEnd Structure