C# Definition:

using System;
using System.Runtime.InteropServices;

/// <summary>
/// The BITMAP structure defines the type, width, height, color format, and bit values of a bitmap.
/// </summary>
[Serializable]
[StructLayout(LayoutKind.Sequential)]
public struct BITMAP
{
     /// <summary>
     /// The bitmap type. This member must be zero.
     /// </summary>
     public int bmType;

     /// <summary>
     /// The width, in pixels, of the bitmap. The width must be greater than zero.
     /// </summary>
     public int bmWidth;

     /// <summary>
     /// The height, in pixels, of the bitmap. The height must be greater than zero.
     /// </summary>
     public int bmHeight;

     /// <summary>
     /// The number of bytes in each scan line. This value must be divisible by 2, because the system assumes that the bit 
     /// values of a bitmap form an array that is word aligned.
     /// </summary>
     public int bmWidthBytes;

     /// <summary>
     /// The count of color planes.
     /// </summary>
     public int bmPlanes;

     /// <summary>
     /// The number of bits required to indicate the color of a pixel.
     /// </summary>
     public int bmBitsPixel;

     /// <summary>
     /// A pointer to the location of the bit values for the bitmap. The bmBits member must be a pointer to an array of 
     /// character (1-byte) values.
     /// </summary>
     public IntPtr bmBits;
}