public void Delete(Call call) { this.CallHistory.Remove(call); }
public void AddCall(Call call) { this.callHistory.Add(call); }
//Problem 10. Add/Remove/Clear public void Add(Call newCall) { this.CallHistory.Add(newCall); }
public void RemoveCallFromHistory(Call call) { this.CallHistory.Remove(call); }
public void AddCallToHistory(Call call) { this.CallHistory.Add(call); }