switch (group1.Items.Count)
{
case 0:
break;
default:
this.AllGroups.Add(group1);
break;
}
switch (group2.Items.Count)
{
case 0:
break;
default:
this.AllGroups.Add(group2);
break;
}
switch (group3.Items.Count)
{
case 0:
break;
default:
this.AllGroups.Add(group3);
break;
}