static void Main(string[] args)
{
Program obj = new Program();
//obj.pattern1(5);
obj.pattern3(7);
telephone telephoneObj = new telephone();
telephoneObj.answer();
telephone.HangUp();
string a = "aaa";
string b = a.stringConCatHelperMethod("bbb");
Console.WriteLine(a.stringConCatHelperMethod("bbb"));
CustomStringAttribute cus = new CustomStringAttribute();
obj.attri(cus);
}
public void attri(CustomStringAttribute cs)
{
}