你可以先打开VS,然后“视图”=>“服务器资源管理器”尝试创建一个与SQL连接的看看结果如何?
如果可以,说明你连接字符串拼写出现错误,直接拷贝右下角(默认)的属性面板中连接字符串黏贴到程序中即可。
如果仍然不可以,请检查SQL服务是否打开,同时SQL的Report服务是否正常工作,是否安装(可以参考:http://www.cnblogs.com/truth/archive/2010/09/13/1824702.html)
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