Load Report Failure error

Question

I have a combobox (windows app c# VS2005 CR XI R2) when I change selection I want the appropriate report to be displayed. It only works first time!
If I run in debug mode and break on SelectedIndexChanged and then press F5 to continue it will work, but if I just run it without this manual intervention, I get an unhandled exception, the inner exception shows 'Object reference not set to an instance of an object'
The code is paused on the line:
AtWrpt.SetParameterValue("@P1ID", cmbNames.SelectedValue.ToString());
When I hover over Selected Value it has a value, so what Object is not set?
Here's the pertinent bits of code...
//Class variables
private rptAtW AtWrpt;
private ConnectionInfo connectionInfo;
private void cmbNames_SelectedIndexChanged(object sender, EventArgs e) {
     AtWrpt = new rptAtW();
//CRV is the Crystal Reports Viewer on the form
     CRV.ReportSource = AtWrpt;
     AtWrpt.SetParameterValue("@P1ID", CmbNames.SelectedValue.ToString());
     AtWrpt.SetParameterValue("@InclusionType", 1);
     SetDBLogonForReport(AtWrpt);
private void ConfigureCrystalReports() {
     connectionInfo = new ConnectionInfo();
     connectionInfo.ServerName="D
SQLExpress";
     connectionInfo.DatabaseName = "xx";
     connectionInfo.IntegratedSecurity = true;
private void SetDBLogonForReport(ReportDocument reportDocument) {
     Tables tables = reportDocument.Database.Tables;
     foreach(CrystalDecisions.CrystalReports.Engine.Table table in tables) {
          TableLogOnInfo tableLogonInfo = table.LogOnInfo;
          tableLogonInfo.ConnectionInfo = connectionInfo;
          table.ApplyLogOnInfo(tableLogonInfo);
How do I fix this?
I tried adding a timer delay but that didn't work, do I need to clear somethin out before I get the next report?

Answer 1

Fixed!
I don't know where I originally got this code from, but I moved 'CRV.ReportSource = AtWrpt;'
from before setting the paramaters to after setting them, it now works fine!