Excell Interop Problem

[Delforce]

Hi all,
My application allows you to create a new excel file and then double click
it in the list view to start it in excell. If the excell file is an existing
one then I can start it now problem.
The problem is when I create a new excel file in my application and try and
double click it excell starts and has the name of my newly created file
however doesn't show any sheets in the xls file.
If I shut down the computer and run my application and then double click the
xls file that wouldn't open properly b4, all is ok.
The code is below for the creation of the excell file.

Excel.Applicati onClass oExcelApp = new Excel.Applicati onClass();
Excel.Workbook oExcelDoc = oExcelApp.Workb ooks.Add(missin g);

//oExcelDoc.Activ ate();
TestName = this.Directory+ "NewWorkBoo k";
Num = 1;

while(File.Exis ts(TestName.ToS tring() + Num.ToString() + ".xls"))
{
Num++;
}

FileName = TestName.ToStri ng() + Num.ToString() + ".xls";
oExcelDoc.SaveA s(FileName, missing, missing, missing,
missing, missing,
Microsoft.Offic e.Interop.Excel .XlSaveAsAccess Mode.xlNoChange ,
missing, missing, missing, missing, missing);

oExcelDoc.Close ((bool)false,mi ssing,missing);

oExcelApp.Appli cation.Quit();
oExcelApp.Quit( );
ReleaseComObjec t((object)oExce lApp);

Anyone have any suggestions?
Cheers
Del