>>>>>>I'd say it means that tdNullable can be null http://msdn.microsoft.com/en-us/library/b3h38hb0.aspx#Y1537
>>>>>>
>>>>>>You may want to test tdNullable.HasValue to verify whether it contains a value
>>>>>
>>>>>Is there a way to avoid this question mark if there is a possiblity to receive a null value for the parameter?
>>>>
>>>>
>>>>try
>>>>

>>>>Private Function GetNonNullable(ByVal tdNullable As Nullable(Of Date)) As Date
>>>>

>>>
>>>Hence the ? is easier!
>>
>>
>>I know that - but if one wants to avoid the ?
>
>You can't. DateTime cannot contain null. DateTime? can. In your method, however, you'll want to check it:
>
>

>   void MyMethod(datetime? value)
>   {
>     if(value.HasValue())
>     {
>         DoSomethingElse(value.Value); //passes in the value as DateTime type
>     }
>     ...
>   }
>

Re read my answer