Mesh's Smooth Shade Problem i used smooth shade in a mesh and it responde me with a
strange behavior. Some parts of my mesh has smooth shade but for other parts it doesn't have. I tried recalculate inside/outside normals. And a few other things i have read but none of them has worked so far. And one more importing thing is that when i try scultping mode it starts working but as i went back to object mode and render it doesn't work. 

 

This is object mode. As you can see above some parts of it has smooth shade other parts doesn't.



And in this sculpt mode. Which works fine.



And last this one above is different mesh. The look i want in the first mesh should be like this. But can't find a way to fix it.
Yeah, i found out a solution. If someone has a problem like this, what it i did is; I joined smooth shade problem mesh to non smooth shade mesh(This mesh has smooth shade working). And as i joined it fixed ! Then i separate the mesh i joined. That's all i hope this might help someone.