ASP.NET Ajax Calendar

Calendar is a handy feature in booking systems and is one of the comprehensive features integrated in ASP.NET 3.5.
First, you should download Ajax Control Toolkit
(remember to copy the AjaxControlToolkit.dll into the /bin folder of the web site application.)

Then, add the toolkit into the Visual Studio, see get started with the Ajax Control Toolkit (C#)

• On the Toolbox window, right click and select "Add Tab", the tab name as "AJAX Control Toolkit"
• Right click on the tab, select "Choose Items", then browse the directory where you put AjaxControlToolkit.dll, select it.
  

Last, implement calendar in your program, see Display a simple popup calendar
Calendar Samples shows several calendar types using Ajax Control Toolkit

• Add a ToolkitScriptManager
• Add a Textbox
• Add a CalendarExtender