无法阻止在Windows Server 2012上的IIS 8.5中进行回收

I have web ASP.NET application deployed on IIS 8.5 in windows server 2012. Our web is developed to stored some data in RAM. The problem is IIS recycles the web application's pool every 30 mins or sometime 15 mins, etc. It causes the application works wrongly once all data in RAM cleared. I have unchecked all options in Recycling Conditions of the pool in IIS but nothing resolved. I hope somebody can help.I have web ASP.NET application deployed on IIS