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static void Main(string[] args)
{
SqlConnection conn=new SqlConnection(@"Data Source=XXX\YYY;Initial Catalog=ConnectionDEMO;Integrated Security=True");
conn.Open();
SqlConnection conn1 = new SqlConnection(@"Data Source=XXX\YYY;Initial Catalog=ConnectionDEMO;Integrated Security=True");
conn1.Open();
SqlConnection conn2 = new SqlConnection(@"Data Source=XXX\YYY;Initial Catalog=ConnectionDEMO;Integrated Security=True");
conn2.Open();
SqlConnection conn3 = new SqlConnection(@"Data Source=XXX\YYY;Initial Catalog=ConnectionDEMO;Integrated Security=True");
conn3.Open();
//conn3.Close();conn2.Close();conn1.Close();conn.Close();无论有没有这行代码,程序依然与数据库保持3个连接
Console.ReadKey();