SSIS脚本从文件名中删除日期

I need to create a SSIS script to remove the date from file name. for example file name is: TestFile_122413.CSV I need to rename it to TestFile.CSV. I don't know how to keep file extension and how to deal with the date changes on file. I receive this file every day. Here is my code:I need to create a SSIS script to remove the da