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How to do this.Any help will be really appreciated.
There is no magic tool that will detect any condition you want, you have to build an algorithm to do this.
C# allow you to check any given char of a string against space, you have to device an algorithm that will detect a space, count them and give you the position of sixth.
We do not do your HomeWork.
HomeWork is not set to test your skills at begging other people to do your work, it is set to make you think and to help your teacher to check your understanding of the courses you have taken and also the problems you have at applying them.
Any failure of you will help your teacher spot your weaknesses and set remedial actions.
Any failure of you will help you to learn what works and what don't, it is called 'trial and error' learning.
So, give it a try, reread your lessons and start working. If you are stuck on a specific problem, show your code and explain this exact problem, we might help.