private void btnLoad_Click(object sender, EventArgs e)
{
if (lbPatches.SelectedItems.Count != 2)
{
MessageBox.Show("Please select exactly two patches");
return;
}
var selected = lbPatches.SelectedItems;
patch1 = new TerrainPatch();
patch1.Load(Path.Combine(patch_dir, (selected[0] as string) + ".bin"));
patch2 = new TerrainPatch();
patch2.Load(Path.Combine(patch_dir, (selected[1] as string) + ".bin"));
}