public static void CreateCallHistory()
{
GSM testgsm = new GSM();
Call callOne = new Call(new DateTime(2015, 02, 03), new DateTime(2015, 02, 03, 14, 05, 25), "private number", 23);
Call callTwo = new Call(new DateTime(2015, 02, 03), new DateTime(2015, 02, 03, 17, 14, 38), "private number", 701);
Call callThree = new Call(new DateTime(2015, 02, 04), new DateTime(2015, 02, 03, 10, 02, 45), "private number", 411);
//Add few calls
Console.WriteLine("Added few calls");
testgsm.CallHistory.Add(callOne);
testgsm.CallHistory.Add(callTwo);
testgsm.CallHistory.Add(callThree);
Console.WriteLine("Info" + new string('-', 40));
Console.WriteLine("Initial number of calls: {0}", testgsm.CallHistory.Count);
Console.WriteLine("Price of the calls: " + testgsm.CalculateCallPrice());
Console.WriteLine("Longest call: {0}", testgsm.FindLongestCall().Duration);
Console.WriteLine("\nAdd a new call");
testgsm.AddCall(new Call(new DateTime(2015, 02, 04), new DateTime(2015, 02, 03, 10, 33, 45), "private number", 806));
Console.WriteLine("Info" + new string('-', 40));
Console.WriteLine("Number of calls: {0}", testgsm.CallHistory.Count);
Console.WriteLine("Price of the calls: " + testgsm.CalculateCallPrice());
Console.WriteLine("Longest call: {0}", testgsm.FindLongestCall().Duration);
//Delete longest call
testgsm.DeleteCall(testgsm.CallHistory.IndexOf(testgsm.FindLongestCall()));
Console.WriteLine("\nDelete longest call");
Console.WriteLine("Info" + new string('-', 40));
Console.WriteLine("Number of calls: {0}", testgsm.CallHistory.Count);
Console.WriteLine("Price of the calls: " + testgsm.CalculateCallPrice());
Console.WriteLine("Longest call: {0}", testgsm.FindLongestCall().Duration);
Console.WriteLine("\nDelete all call history");
testgsm.DeleteAllHistory();
Console.WriteLine("Info" + new string('-', 40));
Console.WriteLine("Number of calls: {0}", testgsm.CallHistory.Count);
Console.WriteLine(testgsm.CallHistory.Count);
}