i am working with C# application, which has some memory leak problem. When i checked with profiler, i saw private bytes are being increased continuously and after some times it is getting crashed. Can any one tell me what is "Private bytes" and what is the main reason of its increase in size without any request .
Without knowing anything at all about your application, this question is impossible to answer.
Is it a Windows Forms app, WPF, ASP.NET, Silverlight, ... What? What does the application do? What is it doing when this "leak" occurs? Is it idle? Is it doing something in the background? Is it using some 3rd party components? What's the error message, if any, when it crashes?
Where are you getting this statistic from? DO NOT USE TASK MANAGER!