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I want to assign multiple tasks to one employee at a time and one task to multiple employees at a time
this is a vague description of your assignment which covers anything between the 2 extremes. You didn't even give details on the constraints. It is just a very bad description of your HomeWork.
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I am new in asp.net MVC
This is not the problem !
The problem is that you have to design how things must work in the project, design that you obviously haven't done.
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Hope for the better and positive response from experts.
Your question is just rude to everyone here.
Start working !