In .net state management means request send by the client 
can remember state of the previous request means 
maintaining the state of the request.

The ways to maintain the state in asp.net are 
server side state management like
1)session management
2)application 
client side state management like
1)cookies
2)Hidden fields

state management is the art of retaining information between
requests.

There are two types of statemanagement options in .net?
1)client side state management.
2)Server side state management.

In client side state management.
1)view state
2)query string 
3)custom cookies

In server side state management.
1)Session state.
2)application state.

State management in ASP.Net 
we can maintain state in ASP.Net in two ways.
1.Client Side Management.
2.Server Side Management.
1.Client Side Management:
a) Cookies
b) Hidden Variable
c) View State
d) Query String
2.Server Side Management
a) Sessions
b) Application State
c) Database

keep in mind

client side state management are
1.Cookies
2.ViewState
3.Hidden Variable
4.Query string

Server Side statemanagement

1.Session state 
2.Application state

we can maintain state in ASP.Net in two ways.
1.Client Side Management.
2.Server Side Management.
1.Client Side Management

1.View state
2.Control state
3.Hidden fields
4.Cookies
5.Query strings
2.Server Side Management.
1.Application state
2.Session state
3.Profile Properties