What is and where need DependencyObject and dependency property

Question

Hi can any one tell me what is DependencyObject and whay use this and where need this and also dependency property.

Priya Linge · Answer

Hi 1.a Dependency Property is like any other property but can hold a default value with built in mechanism for property value validation and automatic notification for changes in property value . any binding in silverlight is to binded to a Dependency Property. Dependency properties can hold an optional default value and can propagate the default value down the element tree. Example : Suppose we create 1 button dynamically and we want add that button in grid . Grid.RowPropertyGrid.ColumnProperty is the most common dependency property. Before we add the button to the grid.children collection we can set this row/col properties like: btn.SetValue(Grid.RowProperty 1) btn.SetValue(Grid.ColumnProperty 1) then we just use myGrid.Children.Add(btn) and the button will get to the correct row/column of the grid. Samething with Canvas. we can add button in canvas using their dependency properties like Canvas.LeftProperty Canvas.TopProperty Please check below link for more information. http://geekswithblogs.net/Silverlight2/archive/2008/12/24/understanding-dependency-properties-in-silverlight.aspx Hope this will help you. Thnaks.