what is default access modifier for constructor and class in c#?

For a class default access modifier :is
1. Internal if class declared directly within a namespace
2. private if it is a nested class
For more have a look here: http://msdn.microsoft.com/en-us/library/ms173121.aspx[^]

For constructor default access modifier is:
private if programmer defines it but if no constructor is explicitly defined by programmer, a public default constructor will be automatically defined)
For more have a look at: http://stackoverflow.com/questions/2521459/what-are-the-default-access-modifiers-in-c[^]

Thanks.

It is by default public. However you can change it as per your requirement.

By default its Public but you can change it as per your requirement