Question

Is it possible to add custom object as a key in HashTable,if so how to retrieve the stored value?

Answer

Yes. Its certainly possible to store custom object as a key in hashtable. Since hashtable key is of type "object", we can use any type of object as key. I didn't find any usage with adding custom object as key. I presume this question is to test candidate analytic skills.

Eg:

        Hashtable ht = new Hashtable();
        Customer objCustomer = new Customer();
        objCustomer.CustomerID = 1;
        objCustomer.CustomerName = "Ram";
        ht.Add(objCustomer, objCustomer);
        Customer obj = ht[objCustomer] as Customer;

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