I have make database on vs 2013 c# project. I have add connection but when i run program connection automatically get closed. I have put con.open() in code but it gives error cannot open connection why ???I have make database on vs 2013 c# project. I h
阅读背景：
当我构建解决方案或运行我的程序时，我的数据库连接自动关闭为什么？
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