plz tell me , how can i get the .exe file in asp.net. or we can create it.

First you create a new class Library from the application by New Project ->Class Library ->
give some name to it .and then put your logic into it.Then build the project u created.
Now to include the .dll/.exe into another applications
go to solution explorer and right click then go to add references and browse ur dll file and add to your solution in the bin folder.
This is the whole method.

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