winforms - Telerik Reports parameters from WindowsForm Codebehind to Report -

i'm working on windows forms application want load reports reportviewer after click on button. event gets triggered pressing on button in code behind of windows form:

    private void button1_click(object sender, eventargs e) {      telerik.reporting.instancereportsource reportsource = new     telerik.reporting.instancereportsource();     reportsource.reportdocument = new reportlibrary.report1();      reportsource.parameters.add(new telerik.reporting.parameter("ordernumber","123456789"));      reportviewer1.reportsource = reportsource;     reportviewer1.refreshreport();  } 

the problem have no idea how can access / parameter added before refreshing reportviewer. report has set datasource. don't know if matters. have right now. i've tried , i'm not getting further.

        public report1()         {             initializecomponent();              position[] = new position[]{                 new position("test", "test","test"),              };              this.datasource = all;               messagebox.show("number: " +              this.report.reportparameters["ordernumber"].value.tostring());          } 

is there way parameter straight after initializecomponent(); ? need add event report access it? if yes on best way this?

any apreciated. thank you

set parameters of report on instance of report (not report source), such as:

        toppageviews report = new toppageviews();         report.reportparameters["startdate"].value = new datetime(2013, 3, 1);         report.reportparameters["enddate"].value = new datetime(2013, 3, 1);          instancereportsource reportsource = new instancereportsource();         reportsource.reportdocument = report;          this.reportviewer1.reportsource = reportsource;         this.reportviewer1.refreshreport(); 

in report constructor, after initializecomponent, subscribe handler itemdatabinding event:

    this.itemdatabinding += toppageviews_itemdatabinding; 

and in handler, can obtain value would:

    datetime startdateparm = (datetime)this.reportparameters["startdate"].value; 

you can use debugger see value.