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SqlConnection conn = new SqlConnection("server = (local)\\sqlexpress;integrated security = SSPI;database = Northwind");
            conn.Open();
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Cannot open database "Northwind" requested by the login. The login failed.
Login failed for user 'hp-326-PC\hp-326'.
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SqlConnection conn = new SqlConnection(
"Data Source=localhost;Integrated Security=SSPI;Initial Catalog=Northwind;");

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requested by the login. The login failed
ÒªÇóµÇ½,µ«µÇ½ʧ°Ü.
NorthwindÒ»°ãÊÇûÓÐÓÃÃÜÂëµÄ

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        string conn = System.Configuration.ConfigurationManager.ConnectionStrings["ÄãµÄÁ¬½Ó×Ö·û´®"].ToString();

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http://blog.csdn.net/clzdl/archive/2009/07/10/4338284.aspx

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SqlConnection conn = new SqlConnection("server = (local)\\sqlexpress;database = Northwind" uid=sa; pwd=123);

uid ÊǵǽÃû
pwd ÊÇÃÜÂë

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uid
pwd
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