关于.cs编译成dll的问题~~
TC里面部分程序
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
namespace StudentSystem
{
class TC
{
private string sql;
db sdb = new db();//为什么TC编译不出TC.dll??
//public static int j=0;
public TC()
{