Managing data within events A and B, when event C fires

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I have three events, using event handler methods as depicted below.
Two of those event handler methods need to reset specific data
whenever the other event left fires. I wasn't sure how to properly
implement that, is there a better way than using state management
variables for each timer as i'm doing in the outline below?



private string szProperty1 = null;
// updated by class consumer
public string Property1
{
get { return this.szProperty1; }
set { this.szProperty1 = value; }
}

// state management
private string szProperty1Last1 = null;
private string szProperty1Last2 = null;
private string szProperty1Last3 = null;

private string szProperty2 = null;
private string szProperty3 = null;



[interval: 100ms]
private void EventHandlerMethod1
{
// exit if szProperty1 == null or no event subscriptions
// if szPropertyLast1 != szProperty1, set szPropertyLast1 =
szProperty1, fire event
}

[interval: 100ms]
private void EventHandlerMethod2
{
// exit if szProperty1 == null or no event subscriptions
// if szPropertyLast2 != szProperty1, set szPropertyLast2 =
szProperty1, reset szProperty2, fire event
}

[interval: 500ms]
private void EventHandlerMethod3
{
// exit if szProperty1 == null or no event subscriptions
// if szPropertyLast3 != szProperty1, set szPropertyLast3 =
szProperty1, reset szProperty3, fire event
}
.