C# what is the meaning of where T : class, new()

Question

see 2 sample code
class DataStore<T> where T : class, new()
{
public T Data { get; set; }
}

class DataStore<T> where T : new()  
{  
    public T Data { get; set; }  
}  

what is difference between where T : new() and where T : class, new() ? thanks

Answer 1

The answer is here

where (generic type constraint) (C# Reference) and new constraint (C# Reference)