连接池

我有以下代码，如果我在最后使用 conn == null ，我仍然使用连接池吗？ 我知道关闭连接是一个很好的做法，但是如何处理整个连接对象呢？

    public void ExecuteNonQuery(SqlCommand Cmd)
    {
        //========== Connection ==========//
        SqlConnection Conn = new SqlConnection(strConStr);

        try
        {
            //========== Open Connection ==========//
            Conn.Open();

            //========== Execute Command ==========//
            Cmd.Connection = Conn;
            Cmd.CommandTimeout = 180;
            Cmd.ExecuteNonQuery();
        }
        catch (Exception Exc)
        {
            throw Exc;
        }
        finally
        {
            //======== Closing Connection ========//
            if (Conn.State == ConnectionState.Open)
            { Conn.Close(); }

            //======== Disposing object ========//
            Conn = null;
        }
    }

首先，考虑使用using，第二，让框架来处理处置。这托管提供商 http://ondotnet.com/pub/a/dotnet/2004/02/09/connpool.html将根据连接字符串进行池化。

public void ExecuteNonQuery(SqlCommand Cmd) 
{ 
    //========== Connection ==========// 
    using(SqlConnection Conn = new SqlConnection(strConStr))
    { 
        //========== Open Connection ==========// 
        Conn.Open(); 

        //========== Execute Command ==========// 
        Cmd.Connection = Conn; 
        Cmd.CommandTimeout = 180; 
        Cmd.ExecuteNonQuery(); 
    } 
}