Floremin questions

Floremin answers

• Vertical-floating elements in CSS?
• How to return on client error message with status code
• Why is await async so slow?
• why does checkchanged event does not fire on uncheck of checkbox in asp.net
• Binding List to GridView
• Execute Callback(obj) if callback Exists Else return object
• How to switch to datetime2 in Entity Framework / SQL Server 2008 project
• How to add "required" attribute to mvc razor viewmodel text input editor
• MVC 4 / Entity Framework 5 / Code First - Persisting a collection (list of objects) in a view - a few questions