C# 逻辑运算

string str1 = "11101110010111111111111";
string str2 = "11111110010000000000000";
string str3 = "11111110010111111111111";
var s =Convert.ToInt64(str1, 2);
var s2 = Convert.ToInt64(str2, 2);
string result =Convert.ToString(s | s2,2).ToString();//str3