ADO.NET操作数据库的写法

/// public void Student(Student sd)
{
    List<SqlParameter> sqlList = new List<SqlParameter>();
    sqlList.Clear();
    Hashtable ht = new  Hashtable();
    string fields = "";
    //姓名
    fields+="name=@name";
    sqlList.Add(new SqlParameter("@name","sd.Name")) ;
    //年龄
    fields+=",age=@age";
    sqlList.Add(new SqlParameter(""))    
   }