Check value type of extended class instance

I have

BaseClass

BaseClass

and

MyClass : BaseClass

MyClass : BaseClass

.

Using

val is BaseClass

val is BaseClass

will return true for any object that is, or extends

BaseClass

BaseClass

.
How can I check if the object is of type

MyClass

MyClass

, and not

BaseClass

BaseClass

Check value type of extended class instance - C#