Default Value from Database not working

[Pichate]

I have to Insert data from gridview. On SQL SERVER  column on table set default value (getdate ())  when adding the result to be empty.

but I test Excute sql command on the Management studio default value is Correct.


I am not sure that is the Model or something wrong.

http://upic.me/i/tm/4-9-201214-17-40.png   this my poperties 

Please help me.