error on saving modified existing xls file

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What steps will reproduce the problem?
1.open the existing excel and trying to modify and then save
2.
3.

What is the expected output? What do you see instead?
with compiler i get error in this line
"this.Writer = new BinaryWriter(this.FileStorage, Encoding.Unicode);"
error is : Stream was not writable.

What version of the product are you using? On what operating system?
i've just get the version from dll file is "1.0.0.0" and iam using windows XP

Please provide any additional information below.
trying open file excel and modiying the cell value and then save, iam have
error occured..

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Original issue reported on code.google.com by `theebrut...@gmail.com` on 29 Sep 2010 at 10:47

Reproduce the reported flow on Windows if available: open an existing XLS file, modify a cell, and save it. Start at the reported BinaryWriter line, "this.Writer = new BinaryWriter(this.FileStorage, Encoding.Unicode);", and determine why the stream is not writable; done means the modified workbook saves without that error.

Written by the indexing model from the issue text.