連接超出作用域后不會自動關閉也不能由垃圾回收機制來釋放必須手動關閉或釋放該資源

5、連接sqlserver 實例

（1）使用windows認證

using System;

using System.Collections.Generic;

using System.Text;

using System.Data.SqlClient;

namespace sqlconnection1

{

class Program

{

static void Main(string[] args)

{

string source = "Data Source=duanyf//SQLEXPRESS;" + "Initial Catalog=master;"+"Integrated Security=True";

SqlConnection con = new SqlConnection(source);

try

{

con.Open();

Console.WriteLine("connection is successful!");

}

catch (Exception e)

{

Console.WriteLine("connection error is :{0}", e.ToString());

}

Console.ReadLine();

con.Close();

}

}

}

（2）使用sqlserver認證

using System;

using System.Collections.Generic;

using System.Text;

using System.Data.SqlClient;

namespace sqlconnection1

{

class Program

{

private void SQLConnectionF(string source)

{

SqlConnection con = new SqlConnection(source);

try

{

con.Open();

Console.WriteLine("connection is successful!");

}

catch (Exception e)

{

Console.WriteLine("connection error is :{0}", e.ToString());

}

}

static void Main(string[] args)

{

string sou = "server=duanyf//SQLEXPRESS;" + "Initial Catalog=master;" + "UID = sa;"+"Password = aaa";

Program sqlcon = new Program();

sqlcon.SQLConnectionF( sou);

Console.ReadLine();

//con.Close();

}

}

}

我是把代碼復制過來的，在live writer中有點亂 也沒法排，復制到visualstudio中就好了。

轉載于:https://www.cnblogs.com/dyufei/archive/2009/12/11/2573965.html

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