Here is the free tool for the stress testing in asp.net application.
https://docs.microsoft.com/en-us/archive/blogs/alikl/stress-test-asp-net-web-application-with-free-wcat-tool
Another is called asp.net performance engineering which will tell how we can stress application.
https://docs.microsoft.com/en-us/archive/blogs/alikl/asp-net-performance-engineering-stress-test-your-architecture-design-and-code
Also go through the following post:
Best way to stress test a website
From my experience before moving to the production environment please take of following things.
set debug=false into the web.config
set trace enabled=false into the web.config
Always use precompiled version of your code.
Compile your project into the release mode.
Publish your code if you are using asp.net 2.0 or higher version
User caching api as much as possible.
Decrease your html kb.
remove blank spaces from the asp.net html code.
Use stylesheet as external .css file
USE IIS Compression if poosible.
Put your javascript file in .js files
Use Server.Transfer instead of Response.redirect
Use Inproc Session State if possible.
Use Viewstate efficiently- Use controlstate instead of viewstate which is newer feature in asp.net 2.0
Avoid giving big name to controls it will increase your html kb.
Use Div instead of tables it will decrease your size.
Do IIS Performance tuning as per your requirement
Here is the good link that teaches us good way of deployment in production environment.
http://www.vbdotnetheaven.com/UploadFile/dsdaf/111222006014732AM/1.aspx
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