c# DropDownList获取值

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: Exception in JSP: /admin/questionmanager.jsp:143

140: </tr>
141: <%
142: sqlt2=conn.createStatement(); //---------
143: rsTmp = sqlt2.executeQuery("select count(*) as mycount from test_question_lib");
144: rsTmp.next();
145: int totalrecord = rsTmp.getInt("mycount");
146: if(totalrecord % PageSize == 0)

Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:504)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:375)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

root