What is Control's DesignMode property and how to use it?

what is DesignMode pro开发者_如何学Pythonperty? When it is useful? I don't understand it from msdn definition http://msdn.microsoft.com/en-us/library/system.web.ui.control.designmode.aspx

Some example? Thanks for answer.

The DesignMode property will be set to True when you are editing your asp.net page in Visual Studio. For example if you create a chart control you could show a chart based on dummy data during design-time and at run-time generate a chart based on the provided data.

This is a property that let's you know if you are running in Visual Studio Designer. It is helpful when you are writing a custom control and you want it to behave differently during design time.

One example of when you might use DesignMode is for design time specific behavior, for instance is when creating a custom control and you want to set its display text equal to the name of the control:

if (DesignMode && string.IsNullOrEmpty(Text))
  Text = Name;