目录1. System.Collections 命名空间中的集合2. System.Collections.Generic 命名空间中的集合在C#中，集合是用于存储和操作一组数据项的数据结构。这些集合通常位于 System.Collections&n
hi i have a table as followsid,school,address,city,state,phone,email,fax . There is almost 40 cities . I need to select 1 entry from each city. can any one guide me
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