c# DbHelperSQL不可访问因为具有保护级别问题！

[摸鱼仔啊k]

        /// <summary>
        /// 是否存在该记录
        /// </summary>
        public bool Exists(int 学号)
        {
            StringBuilder strSql = new StringBuilder();
            strSql.Append("select count(1) from 学生信息");
            strSql.Append(" where 学号=" + 学号 + " ");
            return DbHelperSQL.Exists(strSql.ToString());
        }

DbHelperSQL 类中

 /// <summary>
        /// 是否存在该查询记录
        /// </summary>
        /// <param name="strSql"></param>
        /// <returns></returns>
        public static bool Exists(string strSql)
        {
            object obj = DbHelperSQL.GetSingle(strSql);
            int cmdresult;
            if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
            {
                cmdresult = 0;
            }
            else
            {
                cmdresult = int.Parse(obj.ToString());
            }
            if (cmdresult == 0)
            {
                return false;
            }
            else
            {
                return true;
            }
        }

[xuzuning]

public class DbHelperSQL

[摸鱼仔啊k]

哇哇哇！解决啦，发现public不见了，谢谢大佬