Use of new() keyword in Generics Methods

Question

I would like to know what is the use of new keyword in generic function.Please find the file attached.. Explain me with some more sample code....

Vulpes · Answer

The new() constraint means that the generic type parameter to which it is applied has a parameterless constructor. So in this generic method: public static T GetInHeaderProperty (this T Program) where T : IInHeaderType new() { dynamic result = new T(); result.CompanyId = Test; result.UserId = Test; result.Password = Test; result.MessageId =  ; return (T)result; } we know that type T has a parameterless constructor and hence the highlighted line compiles OK.