could anyone teach me my how to create my calendar...what i want is

for example in

default.aspx

i will insert a textbox & button...the purpose of the button is when the button is pressed another page will popup (calendar.aspx), from that page it will display a calendar control. if a date is selected it will passed the value to the textbox from default.aspx....

one question ... why would you create your own? there's so many already...

here's just a couple quick examples:

http://www.codeproject.com/Ajax/AJAXDatePicker.asp

 http://www.dynarch.com/projects/calendar/

Ez416:

what if i want to sell the program that i developed but i used a 3rd party control...is it legal? 

You'll need to check the license of the component.

Hi Ez416,

We offer a couple popup calendars (date pickers) that you might want to check out before investing time into building your own. We offer two versions. BDPLite (Free) and BasicDatePicker.

The License Agreement for BDPLite is fairly liberal and includes redistributing BDPLite as part of a larger application. For example, if you are building a scheduling application and plan to sell copies of that application to many customers, it is acceptable to include BDPLite within the application.

The following statement is pulled from our License Agreement:

Basic Date Picker Lite (“BDPLite”) License:
Without payment of a fee whatsoever, in consideration for the mutual covenants contained herein, we grant you a non-transferable and non-exclusive license to install and use the SOFTWARE in any location or application developed by your organization. Redistribution is permitted but only as part of a compiled solution that adds significant functionality to the SOFTWARE product, and provided that the copyright notice, located in a HTML comments, remain intact. SOFTWARE may not be redistributed in a non-compiled form.

Full details of the License Agreement are available online at http://basicdatepicker.com/support/licenseagreement.aspx

If you are interested in testing out BDPLite, you can download the installer from http://www.basicdatepicker.com/download/ 

We have several code samples online at http://www.basicdatepicker.com/samples/

Hope this helps.