小弟刚学WINFROM开发,现在在做一个小项目,在里面新建了一个类,用来访问数据库。现在遇到的问题是引用了命名空间后,却找不到相应的类。using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;
using System.Data;
namespace Test1
{
private SqlConnection conn = null;
private SqlCommand cmd = nul;
class DAO
{
}
}引用了using System.Data.SqlClient;空间,却找不到SqlConnection 和 SqlCommand 这二个类,请各位高手帮忙解决
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;
using System.Data;
namespace Test1
{
private SqlConnection conn = null;
private SqlCommand cmd = nul;
class DAO
{
}
}引用了using System.Data.SqlClient;空间,却找不到SqlConnection 和 SqlCommand 这二个类,请各位高手帮忙解决
class DAO
{
private SqlConnection conn = null;
private SqlCommand cmd = nul;
}
类 class
结构 struct
枚举 enum
private SqlCommand cmd = nul;
放在class当中或者放在class的method当中.
private SqlCommand cmd = nul;放在类里面