AjaxControlToolkit.AlwaysVisibleControlExtender.EnsureValid C# (CSharp) Method

        public override void EnsureValid()
        {
            base.EnsureValid();

            // Ensure the offsets are positive values
            if(VerticalOffset < 0)
                throw new ArgumentOutOfRangeException(string.Format(CultureInfo.CurrentCulture,
                    "AlwaysVisibleControlExtender on '{0}' cannot have a negative VerticalOffset value", TargetControlID));
            if(HorizontalOffset < 0)
                throw new ArgumentOutOfRangeException(string.Format(CultureInfo.CurrentCulture,
                    "AlwaysVisibleControlExtender on '{0}' cannot have a negative HorizontalOffset value", TargetControlID));
            if(ScrollEffectDuration <= 0)
                throw new ArgumentOutOfRangeException(string.Format(CultureInfo.CurrentCulture,
                    "AlwaysVisibleControlExtender on '{0}' must have a positive ScrollEffectDuration", TargetControlID));
        }