为什么会出现未赋值的局部变量？？求大神

string strRst; // 员工总工资信息
            string strNO; // 员工编号
            string strName; // 员工姓名
            double totalSalary; //员工总资
            double basicWage; //基本工资
            double totalBudiness; //业务总额

            Console.WriteLine("请输入员工编号");
            strNO = Console.ReadLine();
            Console.WriteLine("请输入员工姓名");
            strName = Console.ReadLine();
            Console.WriteLine("请输入员工月基本工资");
       ;
            basicWage = double.Parse(Console.ReadLine());
            Console.WriteLine("请输入员工月业务总额");
            basicWage = double.Parse(Console.ReadLine());


            totalSalary = basicWage + (totalBudiness - 10000) * 0.1;

            strRst = "工资信息如下：/n员工编号：" + strNO + "\n员工姓名" + strName + "\n员工单月工资" + strRst + "元";
            Console.WriteLine("员工单月工资:\n" +
              strRst);
            Console.ReadKey();