Sorry i could n't noticed that.I will read your suggestion and get back to you if any queries

Are you suggesting InternalVisible to be used in the parent class? Up to my knowledge InternalVisible access modifier is not there in c#

If we create static class , we cannot able to create instance. but ,my query is that instance should be created only one time and restrict to more than one.

I want to allow the class to create only one object instance. I want to make visible the class ouside the assembly but restrict to only one assembly. What needs to do? Please suggest me.

Thaks for your reply

If I use http://Localhost/virtualdirectory it is working but If I use http://IP/virtualdirectory it is not working in that server. Please suggest me