you need to write a program to read excel file using .net and use the same application to write back into another excel.

Hi,

Do you mean manipulate Excel without it being installed on the machine or do you just want a way to do it in .net as opposed to vba?

If you don't mind excel being installed on the machine, then you can use Interop. Here is a sample: DevX.com

As for the other, I'm not 100% sure, I did do a project where I was trying to manipulate newer versions of excel as they are basically compressed XML files but I didn't get very far before we had to pull the plug.

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