How to set two Conditions Simultaneously in set where clause

Hi,
I have a messgechoice item , and i need to fire messagechoice VO with two conditions.
For Eg:-- we have three Items ProjectContractor& Work Order on a custom Page , now i need work order list should populate on lelection of project & contractor both, so i have apply a fire partial event on contractor where i i get the parameter values as follows:--
CO Code
if("OrderNoself".equals(event))
String value21 = (String)pageContext.getParameter("ProjectName");
System.out.println("The Selected Project Name for self Contractor is "+value21);
String value22 = (String)pageContext.getParameter("ContractorName");
System.out.println("The SelectedContractor Name for ContractorName is "+value22);
Serializable [] params11 = {value21,value22} ;
am.invokeMethod("initWorkOrderNumberself",params11);
AM Code
public void initWorkOrderNumberself(String ProjectName,String ContractorName");
getDprWorkOrderpopVO1().setWhereClause("PROJECT_NAME = " + "'"+ProjectName+"'");
getDprWorkOrderpopVO1().setWhereClause("CONTRACTOR_NAME = " + "'"+ContractorName+"'");
getDprWorkOrderpopVO1().executeQuery();
Now when i run my form then Work order list only populateon set conditions ofContractor NAme only.
Please suggest....

Hi Tarun,
Thanx for ur reply,
i have used below mwntioned code provided by you but still i m getting error...
public void initWorkOrderNumber(String ProjectName,String ContractorName)
//getDprWorkOrderpopVO1().setWhereClause("CONTRACTOR_NAME = " + "'"+ContractorName+"'");
//getDprWorkOrderpopVO1().executeQuery();
getDprWorkOrderpopVO1().setWhereClause("PROJECT_NAME =:1 AND CONTRACTOR_NAME=:2");
getDprWorkOrderpopVO1().setWhereClauseParams(null);
getDprWorkOrderpopVO1().setWhereClauseParam(1,ProjectName);
getDprWorkOrderpopVO1().setWhereClauseParam(2,ContractorName);
getDprWorkOrderpopVO1().executeQuery();
ERROR:---
oracle.apps.fnd.framework.OAException: oracle.jbo.SQLStmtException: JBO-27122: SQL error during statement preparation. Statement: SELECT * FROM (select * from omaxe_work_order_headers
where work_order_number is not null) QRSLT WHERE (PROJECT_NAME =:1 AND CONTRACTOR_NAME=:2)
     at oracle.apps.fnd.framework.OAException.wrapperException(OAException.java:888)
     at oracle.apps.fnd.framework.OAException.wrapperException(OAException.java:862)
     at oracle.apps.fnd.framework.OAException.wrapperInvocationTargetException(OAException.java:985)
     at oracle.apps.fnd.framework.server.OAUtility.invokeMethod(OAUtility.java:210)
     at oracle.apps.fnd.framework.server.OAUtility.invokeMethod(OAUtility.java:152)
     at oracle.apps.fnd.framework.server.OAApplicationModuleImpl.invokeMethod(OAApplicationModuleImpl.java:721)
     at omaxe.oracle.apps.xxopa.boqmain.webui.OmaxeDPRCO.processFormRequest(OmaxeDPRCO.java:107)
     at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processFormRequest(OAWebBeanHelper.java:799)
     at oracle.apps.fnd.framework.webui.OAWebBeanContainerHelper.processFormRequest(OAWebBeanContainerHelper.java:363)
     at oracle.apps.fnd.framework.webui.OAPageLayoutHelper.processFormRequest(OAPageLayoutHelper.java:1118)
     at oracle.apps.fnd.framework.webui.beans.layout.OAPageLayoutBean.processFormRequest(OAPageLayoutBean.java:1579)
     at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processFormRequestChildren(OAWebBeanHelper.java:995)
     at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processFormRequestChildren(OAWebBeanHelper.java:961)
     at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processFormRequest(OAWebBeanHelper.java:816)
     at oracle.apps.fnd.framework.webui.OAWebBeanContainerHelper.processFormRequest(OAWebBeanContainerHelper.java:363)
     at oracle.apps.fnd.framework.webui.beans.form.OAFormBean.processFormRequest(OAFormBean.java:395)
     at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processFormRequestChildren(OAWebBeanHelper.java:995)
     at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processFormRequestChildren(OAWebBeanHelper.java:961)
     at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processFormRequest(OAWebBeanHelper.java:816)
     at oracle.apps.fnd.framework.webui.OAWebBeanContainerHelper.processFormRequest(OAWebBeanContainerHelper.java:363)
     at oracle.apps.fnd.framework.webui.beans.OABodyBean.processFormRequest(OABodyBean.java:363)
     at oracle.apps.fnd.framework.webui.OAPageBean.processFormRequest(OAPageBean.java:2633)
     at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:1659)
     at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:497)
     at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:418)
     at OA.jspService(OA.jsp:40)
     at com.orionserver.http.OrionHttpJspPage.service(OrionHttpJspPage.java:56)
     at oracle.jsp.runtimev2.JspPageTable.service(JspPageTable.java:317)
     at oracle.jsp.runtimev2.JspServlet.internalService(JspServlet.java:465)
     at oracle.jsp.runtimev2.JspServlet.service(JspServlet.java:379)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:727)
     at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:306)
     at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:767)
     at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:259)
     at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:106)
     at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:803)
     at java.lang.Thread.run(Thread.java:534)
## Detail 0 ##
java.sql.SQLException: ORA-01006: bind variable does not exist
Regards
Saurabh

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