ondatabing even problem on crystal report 13.0.0.99 vs 2010

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ASP.NET

Hello dear,

I have in problem on crystal report ondinding event. I have an aspx page within a dropdown list and button and also a crystal report viewer. In normal situation everything is ok, But when i am trying to add ondatabinding event into report viewer. My button click event wont read value from dropdon list !!!! Please help me how can i read value from dropdown. My code is

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
               <ContentTemplate>
                   <CR:CrystalReportViewer ID="CrtViewer" runat="server" AutoDataBind="true"
                       ToolPanelView="None" ShowAllPageIds="True" ReuseParameterValuesOnRefresh="True"
                       OnDataBinding="CrtViewer_DataBinding" />
               </ContentTemplate>
               <Triggers>
                   <asp:PostBackTrigger ControlID="CrtViewer" />
               </Triggers>
           </asp:UpdatePanel>

ReportDataGateway rptGateway =new ReportDataGateway();
DataTable ds=new DataTable();
int projId = Convert.ToInt32(ddlEmpProject.Value); // facing problem here
string month = selectMonth.Value;
string year = selectYear.Value;
ds = rptGateway.GetPayReportByProjectAndMonth(projId, month, year);
PayRollReportByProjectAndYearAndMonth report = new PayRollReportByProjectAndYearAndMonth();
report.SetDataSource(ds);
CrtViewer.ReportSource = report;
CrtViewer.PDFOneClickPrinting = true;
CrtViewer.RefreshReport();