private int Add(Original original)
{
if (original == null || original.image == null)
{
throw new ArgumentNullException("value");
}
int index = -1;
AssertInvariant();
if (original.image is Bitmap)
{
if (owner.originals != null)
{
index = owner.originals.Add(original);
}
if (owner.HandleCreated)
{
Bitmap bitmapValue = owner.CreateBitmap(original);
index = owner.AddToHandle(original, bitmapValue);
}
}
else if (original.image is Icon)
{
if (owner.originals != null)
{
index = owner.originals.Add(original);
}
if (owner.HandleCreated)
{
index = owner.AddIconToHandle(original, (Icon)original.image);
}
}
else
{
throw new ArgumentException(SR.GetString(SR.ImageListBitmap));
}
return(index);
}
