ExecuteNonQuery方法只返回实现影响行数，好像无法实现数据库的查询

            string defaultConStr = System.Configuration.ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
            SqlConnection conn = new SqlConnection(defaultConStr);
            string Str = "插入/修改/删除 SQL语句/存储过程";
            conn.Open();
            SqlCommand comm = new SqlCommand();
            comm.CommandText = Str;
            comm.Connection = conn;
            int rows_Str = comm.ExecuteNonQuery();
            if (rows_Str != 0)
            {
                //
            }
            else
            {
                //
            }
            conn.Close();