近日，加拿大男歌手贾斯汀·比伯来中国演出的事宜遭禁，据官方回应，因贾斯汀·比伯的个人行为导致出现负面形象。
I was using an .mdf for connecting to a database and entityClient. Now I want to change the connection string so that there will be no .mdf file.
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