C#

public class MySampleApiWrapper
{

  /// <summary>
  /// The structure of the Icon information.
  /// </summary>
  [StructLayout(LayoutKind.Sequential)]
  public struct ICONINFO
  {
      /// <summary>
      /// If true, then this struct defines an icon. If false, then it's a cursor.
      /// </summary>
      public bool bIcon;
      /// <summary>
      /// The X co-ordinate of the icon hotspot.
      /// </summary>
      public int xHotspot;
      /// <summary>
      /// The Y co-ordinate of the icon hotspot.
      /// </summary>
      public int yHotspot;
      /// <summary>
      /// Specifies the icons bitmap mask.
      /// </summary>
      public IntPtr hbmMask;
      /// <summary>
      /// Handle to the icon colour bitmap.
      /// </summary>
      public IntPtr hbmColour;
  }


  /// <summary>
  /// Get the icon information.
  /// </summary>
  /// <param name="hIcon">The handle to the icon.</param>
  /// <param name="piconinfo">The returned <see cref="ICONINFO"/> structure.</param>
  /// <returns>True if the call was successful, false otherwise.</returns>
  [DllImport("user32.dll", EntryPoint = "GetIconInfo")]
  public static extern bool GetIconInfo(IntPtr hIcon, out ICONINFO piconinfo);
}.

 ICONINFO iconInfo = null;
if (GetIconInfo(icon.Handle, out iconInfo))
{
  Trace.WriteLine(iconInfo.xHotspot);
}