ASP.NET C# Bool type casting
bool status1 = (bool)Cache["cache_req_head"];
    bool status2 = (bool)Cache["cache_super"];
    bool status3 = (bool)Cache["cache_head"];

if (checkreqhead == true)
        {
            Cache["cache_req_head"] = true;
        }
        else if (checksuper == true)
        {
            Cache["cache_super"] = true;
        }
        else if (checkhead == true)
        {
            Cache["cache_head"] = true;
        }

bool status1 = (bool)Cache["cache_req_head"];

bool status1 = false;
if (Cache["cache_req_head"] != null)
{
   status1 = (bool)Cache["cache_req_head"];
}

bool? status1 = (bool?)Cache["cache_req_head"];

//string is used as an example; you should put the type you expect
string variable = Cache["KEY"] as string;

if(variable!=null)
{
  // do something
}