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//SQL2005 express版
private string connString = @"server=.\sqlExpress;database=taianDB;uid=sa;pwd=djx1218;pooling=false";
//Windows身份验证:
private string connString = "Data Source=IP\数据库实例名;Initial Catalog=Labeldb;Integrated Security=True";
//SQL SERVER身份验证
private string connString = @"server=.\MainServer;database=taianDB;uid=sa;pwd=djx1218";
你的写法在数据库上有问题,无需加 .mdf
string source = " Data Source = LENOVO-PC; Initial Catalog = NorthWind; Integrated Security = SSPI;";即可