Excel Report not generating

I m using 'Office Window Component' for generating Excel report from my application.so 4 that i've already put the .dll files (for running d excel report) to my bin directory but i found the error message :
'Message: BC30002: Type 'Owc11.Spreadsheet' is not defined.'

original problem showing in d following line
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Line 522: 'excelobj = Server.CreateObject('owc.spreadsheet')
Line 523: ' Dim ex As New OWC.Spreadsheet</font>
Line 524: Dim excelobj As New Owc11.Spreadsheet </font> <--------------- Error Created
Line 525:
Line 526: Dim iexcelcounter As Integer = 10

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can any one help me to prevent this or any other way 2 generate Excel Report from ASP.NET 2
it's too urgent. thank u very much................