好像是这噶语句的错误
            string strConnection = "uid=jfq;password=123456;"; 
            strConnection += "Database=chengjibiao;Server=9AA7107A8CBE4FA;";

            strConnection += "Connect Timeout=30";
            SqlConnection conn = new SqlConnection("chengjibiao");
            SqlDataAdapter da = new SqlDataAdapter("SQL查询语句", conn);
            conn.Open();
            DataTable dt = new DataTable();
            da.Fill(dt);