Date problem in sql server 2005

Hi!

I am using SQL Server 2005 express edition as backend and Visual Basic 2005 express edition as frontend. This question is related to date comparison.

SELECT     IssueDate, Client,  AgencyCode
FROM         SPACEBOOKING
WHERE     (IssueDate BETWEEN CONVERT(DATETIME, '2006-05-01 00:00:00', 102) AND CONVERT(DATETIME, '2006-05-31 00:00:00', 102)) AND (AgencyCode = 1595)
ORDER BY IssueDate


Above query is generated by query designer and it retrieves 16 records.

However, when I use this code in my vb 2005 application and instead of '2006-05-01 00:00:00', I use dtpicker1.value and instead of '2006-05-31 00:00:00' I use dtpicker2.value, it gives me the following error :

The conversion of a char data type to a datetime data type resulted in an out-of-range datetime value.

What is the problem and how to solve it?

My regional date setting id dd/mm/yyyy.