System.Windows.Controls.AutoCompleteBox.OnMinimumPopulateDelayPropertyChanged C# (CSharp) Method

        private static void OnMinimumPopulateDelayPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            AutoCompleteBox source = d as AutoCompleteBox;

            if(source != null && source._ignorePropertyChange)
            {
                source._ignorePropertyChange = false;
                return;
            }

            int newValue = (int)e.NewValue;
            if(newValue < 0)
            {
                if(source != null)
                {
                    source._ignorePropertyChange = true;
                }
                d.SetValue(e.Property, e.OldValue);

                throw new ArgumentException(string.Format(CultureInfo.InvariantCulture,
                    // ReSharper disable once NotResolvedInText
                    Dev2.Runtime.Configuration.Properties.Resources.AutoComplete_OnMinimumPopulateDelayPropertyChanged_InvalidValue, newValue), "value");
            }

            // Stop any existing timer
            if(source != null && source._delayTimer != null)
            {
                source._delayTimer.Stop();

                if(newValue == 0)
                {
                    source._delayTimer = null;
                }
            }

            // Create or clear a dispatcher timer instance
            if(source != null && newValue > 0 && source._delayTimer == null)
            {
                source._delayTimer = new DispatcherTimer();
                source._delayTimer.Tick += source.PopulateDropDown;
            }

            // Set the new tick interval
            if(source != null && newValue > 0 && source._delayTimer != null)
            {
                source._delayTimer.Interval = TimeSpan.FromMilliseconds(newValue);
            }
        }
        #endregion public int MinimumPopulateDelay