> For the complete documentation index, see [llms.txt](https://lightbug14.gitbook.io/ccp/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://lightbug14.gitbook.io/ccp/how-to.../implementation/states/transition-from-one-state-to-another.md).

# Transition from one state to another

## One state

Let's say you want to go from ***StateA*** to ***StateB*** if ***someCondition*** is valid. For this you need to implement the CheckExitTransition in StateA (since you want to leave this state):

```csharp
// StateA.cs --------------------------        
public override bool CheckExitTransition()
{
     if( someCondition )
     {
        // Add StateB to the queue
        CharacterStateController.EnqueueTransition<StateB>(); 
     }     
}
```

If someCondition is true, then StateB will have to handle the transition. To control the result you'll need to implement the ***CheckEnterTransition*** in StateB. By default the *CheckEnterTransition* will accept the transition (returning true).

Let's say StateB can be entered only from StateA:

```csharp
// StateB.cs --------------------------        
public override bool CheckEnterTransition( CharacterState fromState )
{
     // True if fromState is StateA. False otherwise
     if( fromState == CharacterStateController.GetState<StateA>() )
          return true;
     
     return false; 
}
```

## Multiple states

Let's say you have two or more states that can be triggered by the same initial condition (*someCondition* from the previous example). Both uses the same condition, but the target state has some extra conditions as well (*CheckEnterTransition*). If you need to evaluate multiple states you can enqueue them, one after another.

```csharp
// StateA.cs --------------------------        
public override bool CheckExitTransition()
{
     if( someCondition )
     {        
        CharacterStateController.EnqueueTransition<StateB>(); 
        CharacterStateController.EnqueueTransition<StateC>();
     }
     
}
```