C# Definition:

[StructLayout(LayoutKind.Sequential)]
public struct BITMAPINFOHEADER
{
    public uint  biSize;
    public int   biWidth;
    public int   biHeight;
    public ushort   biPlanes;
    public ushort   biBitCount;
    public uint  biCompression;
    public uint  biSizeImage;
    public int   biXPelsPerMeter;
    public int   biYPelsPerMeter;
    public uint  biClrUsed;
    public uint  biClrImportant;
}

VB Definition:

StructLayout(LayoutKind.Explicit)> Public Structure BITMAPINFOHEADER
     <FieldOffset(0)>  Public biSize     As Int32
     <FieldOffset(4)>  Public biWidth     As Int32
     <FieldOffset(8)>  Public biHeight     As Int32
     <FieldOffset(12)> Public biPlanes     As Int16
     <FieldOffset(14)> Public biBitCount     As Int16
     <FieldOffset(16)> Public biCompression     As Int32
     <FieldOffset(20)> Public biSizeImage     As Int32
     <FieldOffset(24)> Public biXPelsperMeter As Int32
     <FieldOffset(28)> Public biYPelsPerMeter As Int32
     <FieldOffset(32)> Public biClrUsed       As Int32
     <FieldOffset(36)> Public biClrImportant  As Int32
End Structure

User-Defined Field Types:

None.

Notes:

None. (Thanks to Mike I for the VB.NET definition).