Cannot close connection of crystal report

[bonita]

In my ASP.NET page, I have 2 checkboxes for users to choose which
crystal report they want to display. These two reports use different
tables. If report1 has been choosen and displayed in the crystal
report, then I cannot check another checkbox to display report2
afterwards. If I close the website and open again, I can choose report2
and display as crystal report correct, but now I cannot check the
checkbox1 to display report 1 afterwards.
This is the error message:

Error in File
C:\DOCUME~1\CHR ISHO\ASPNET\LOC ALS~1\Temp\temp _c58d8a47-521f-4540-bf93-d4f493584892.rp t:
Error in formula <Record_Selecti on>. '{INUTMTI_TERM. part_user} =
{?in_user} and ' This field name is not known.
The table INUTMTI_TERM is the table used by report 1, not by report 2,
but it's trying to access this table when I choose to display report2.
Although I try to close the report in the Page_Unload() method, somehow
the crystal report connection would not close and cause this problem.
I'm attaching my code here (some code deleted to improve readability).
Please give me some hint on how to solve this problem.

Thanks,
Christine
namespace inventory
{

public class userreqterm : System.Web.UI.P age
{
protected CrystalDecision s.Web.CrystalRe portViewer
CrystalReportVi ewer1;
userreqtermCR crReportDocumen t;
userreqtermWCR crReportDocumen t2;
TableLogOnInfo crTableLogOnInf o = new TableLogOnInfo( );
ConnectionInfo crConnectionInf o = new ConnectionInfo( );
TableLogOnInfo crTableLogOnInf o2 = new TableLogOnInfo( );
CrystalDecision s.CrystalReport s.Engine.Databa se crDatabase;
CrystalDecision s.CrystalReport s.Engine.Databa se crDatabase2;
CrystalDecision s.CrystalReport s.Engine.Tables crTables2;
private void Page_Load(objec t sender, System.EventArg s e)
{
crReportDocumen t = new userreqtermCR() ;
crReportDocumen t2 = new userreqtermWCR( );
crConnectionInf o.ServerName = "x.x.x.x";
crConnectionInf o.DatabaseName = "xxxx";
crConnectionInf o.UserID = "xxxx";
crConnectionInf o.Password = "xxxx";
crDatabase = crReportDocumen t.Database;
crTables = crDatabase.Tabl es;
crDatabase2 = crReportDocumen t2.Database;
crTables2 = crDatabase2.Tab les;

foreach(Crystal Decisions.Cryst alReports.Engin e.Table crTable in
crTables)
{
crTableLogOnInf o = crTable.LogOnIn fo;
crTableLogOnInf o.ConnectionInf o = crConnectionInf o;
crTable.ApplyLo gOnInfo(crTable LogOnInfo);
}

foreach(Crystal Decisions.Cryst alReports.Engin e.Table crTable2 in
crTables2)
{
crTableLogOnInf o2 = crTable2.LogOnI nfo;
crTableLogOnInf o2.ConnectionIn fo = crConnectionInf o;
crTable2.ApplyL ogOnInfo(crTabl eLogOnInfo2);
}
}

private void Page_Unload(obj ect sender, System.EventArg s e)
{
crReportDocumen t.Close();
crReportDocumen t.Dispose();
crReportDocumen t2.Close();
crReportDocumen t2.Dispose();
crReportDocumen t = null;
crReportDocumen t2 = null;
crTableLogOnInf o = null;
crTableLogOnInf o2 = null;
crConnectionInf o=null;
crDatabase =null;
crTables = null;
crDatabase2 = null;
crTables2 = null;
CrystalReportVi ewer1.Dispose() ;
CrystalReportVi ewer1 = null;
}
private void run_Click(objec t sender, System.EventArg s e)
{
SqlCommand command = new SqlCommand("inu tmti_upd_chrg", connection);
command.Connect ion=connection;
command.Command Type=CommandTyp e.StoredProcedu re;
command.Command Text = "inutmti_upd_ch rg";
command.Paramet ers.Add(new
SqlParameter("@ in_user",SqlDbT ype.VarChar, 5));
command.Paramet ers["@in_user"].Value=departme nt.SelectedValu e.ToString();
command.Paramet ers.Add(new
SqlParameter("@ in_yyyymmdd",Sq lDbType.DateTim e, 8));
command.Paramet ers["@in_yyyymm dd"].Value=termendd ate.Text.ToStri ng();
connection.Open ();
command.Execute NonQuery();
connection.Clos e();

ParameterFields paramFields = new ParameterFields ();
ParameterField user = new ParameterField( );
ParameterField dept = new ParameterField( );
ParameterField yyyymmdd = new ParameterField( );
ParameterDiscre teValue dcuser = new ParameterDiscre teValue();
ParameterDiscre teValue dcdept = new ParameterDiscre teValue();
ParameterDiscre teValue dcyyyymmdd = new ParameterDiscre teValue();

dept.ParameterF ieldName = "in_dept";
dcdept.Value = department.Sele ctedItem.Text.T oString();
dept.CurrentVal ues.Add(dcdept) ;

user.ParameterF ieldName = "in_user";
dcuser.Value = department.Sele ctedValue.ToStr ing();
user.CurrentVal ues.Add(dcuser) ;

yyyymmdd.Parame terFieldName = "in_yyyymmd d";
dcyyyymmdd.Valu e = termenddate.Tex t.ToString();
yyyymmdd.Curren tValues.Add(dcy yyymmdd);

paramFields.Add (user);
paramFields.Add (dept);
paramFields.Add (yyyymmdd);

if(option.Selec tedValue.ToStri ng()=="L")
{
CrystalReportVi ewer1.ReportSou rce = crReportDocumen t;
CrystalReportVi ewer1.Parameter FieldInfo = paramFields;
CrystalReportVi ewer1.Visible=t rue;
CrystalReportVi ewer1.DataBind( );

}
else if(option.Selec tedValue.ToStri ng()=="W")
{
CrystalReportVi ewer1.ReportSou rce = crReportDocumen t2;
CrystalReportVi ewer1.Parameter FieldInfo = paramFields;
CrystalReportVi ewer1.Visible=t rue;
CrystalReportVi ewer1.DataBind( );

}

crTableLogOnInf o = null;
crTableLogOnInf o2 = null;
crConnectionInf o=null;
crDatabase =null;
crTables = null;
crDatabase2 = null;
crTables2 = null;
}
}
}