vb.net: Hi

I try uploading an excel in one of my ASP.NET application where I
uplopad data from excel. I find the application works fine, as a whole
but when I try to upload one particular excel, the application hangs
while executing the command Excel.Application.Workbooks.Open().
The system does not throw any error, just shows page cannot be
displayed. The application works for the other excel of similar format.
Can any one suggest a fix for it?

Just wondering if you are cleaning up after opening up each Excel
workbook.