A.Data Source=.;Initial Catalog=“XueSheng”;Integrated Security=TrueB.Data Source=.;Initial Catalog=XueSheng;Integrated Security=TrueC.Data Source=学生;D.Data Source=.;Initial Catalog=Main;Integrated Security=True
A.using System.Data.SqlClient;B.using System.Windows.Forms;C.using System;D.using System.Text;