I set my character health percent as condition  when to use Divine Shield, but it fails to launch if at the same time im casting holy light. I'm using Spell.Launch(). How i can stop casting in C#?

Lua.RunMacroText("/stopcasting");

Maybe something like this:

private readonly Spell DivineShield = new Spell("Divine Shield");

// Divine Shield
if (ObjectManager.Me.HealthPercent < 30 && ObjectManager.Me.IsCast && DivineShield.KnownSpell && DivineShield.IsSpellUsable)
{
    Lua.RunMacroText("/stopcasting");
    DivineShield.Launch();
}