please help me.
when i add control or make changes in code at runtime these changes does not updated to my
project.

hmmm..if i'm not mistaken about your problem..maybe you did not stop the Run..stop the runtime first then that's the time you can make changes on ur forms.

I am really to eager to know, how you

add control or make changes in code at runtime

You can't edit form during runtime. If you have edited code, unless you're creating a 64bit app, it should update. Make sure you're starting the code from the top (ie: before your current change) in order for it to run.
If you're creating a ASP.NET app, you if will have to restart in order to get the changes to work.