plz tell me how can I add date box in the vb.net form
adding a date box? do you mean a label or textbox control or are you talking about a calendar control, where the user can pick a date from a calendar type GUI?
if it's a textbox or label you can use the System Date and Time function or you can use the Now() and use Format(Now, "MMMM DD, YYYY") will give you February 19, 2008
or Format(Now"MM/DD/YYYY") will give you 02/19/2008
Date will give you a short date as in the previous example
Time will give you the current time in the computer the software is running.
Take a look at your Date/Time format on MSDN newsgroups for additional information.
If on the other hand, you're attempting to add a calendar control, you need to make sure it's in your toolbox controls and just drag it onto the form and you'll see a long date and time format. If you click on properties, you can change to other formats.