如何根据datetimepicker改变时间而更改我要打开的文件

Question

string path1 = Convert.ToString(dateTimePicker1.Value.Month);
                        string path = @"D:\Z5826504.010";            switch (dateTimePicker1.Value.Month)
            {
                case 0:
                 path  = "Z5826510.009";
                    break;
                case 1:
                 path  = "Z5826511.009";
                    break;
                case 2:
                    path= "Z5826512.009";
                    break;
                default:
                    break;
            }
直接更改dateTimePicker1的值，以改变我要打开的文件没有错误，但是文件没有更改..

Answer 1

string path1 = string.Format("{0:MM}", dateTimePicker1.Value);//月 
                string path2 = string.Format("{0:yyyy}", dateTimePicker1.Value);//年                 
                
                string path = "D:\\Z58265" + path1 + "." + path2.Substring(1, 3);