Thanks to all
first f all thanks to all for your reply, i want to configure developer sandbox.
what is Developer Sandbox
Developer sandboxes are special configuration-only sandboxes intended for coding and testing by a single developer. Multiple users can log into a single developer sandbox, but their primary purpose is to provide an environment in which changes under active development can be isolated until they’re ready to be shared. Just like configuration-only sandboxes, developer sandboxes copy all application and configuration information to the sandbox. Developer sandboxes are limited to 10 MB of test or sample data, which is enough for many development and testing tasks. You can refresh a developer sandbox once per day.
Can any one suggest on this ?