ya guys finally i got the perfect ans.....i have found in google from "Pause and Coroutine " under the link http://forum.unity3d.com/threads/683...al-pause-state..

its really helpful....just use

while (_myPauseState)
{
yield return new WaitForFixedUpdate();
}

in your coroutines....it'll work fine...thank you guys ... its only for pause and resume your game state...and have to find about save...if any one have idea about save,just post that answer...

Save the time, and then pause it, then when you need to resume it, make the time equal to that time...

http://www.unifycommunity.com/wiki/index.php?title=PauseMenu

function PauseGame() {
    savedTimeScale = Time.timeScale;
    Time.timeScale = 0;
    AudioListener.pause = true;
    if (pauseFilter) pauseFilter.enabled = true;
    currentPage = Page.Main;
}

function UnPauseGame() {
    Time.timeScale = savedTimeScale;
    AudioListener.pause = false;
    if (pauseFilter) pauseFilter.enabled = false;
    currentPage = Page.None;
    if (IsBeginning() && start != null) {
        start.active = true;
    }
}

Of course take out what you don't need...

Hope this helps!