SqlConnection sqlConn = new SqlConnection("packet size=4096;user id=sa;data source=.;persist security info=True;initial catalog=Data;password=pass");
            try
            {
                sqlConn.Open();
                MessageBox.Show("连接成功！");
            }
            catch (Exception exp)
            {
                MessageBox.Show(exp.Message);
            }
            finally
            {
                sqlConn.Close();
            }