Solved

Handle DBNull that is a boolean

Posted on 2007-03-29
3
490 Views
Last Modified: 2013-11-07
I've created the following custom function:

Public Function DBNullToBoolean(ByVal Value) As Boolean
      If Value Is DBNull.Value Then
          Return False
      Else
          Return Value
      End If
End Function

...then using only one line of code if the database has a NULL value for "SubmittedIndicator" in the statement below, I can save a value into blnSubmitted variable which is declared as a Boolean, without getting a conversion type error

blnSubmitted = DBNullToBoolean(TABLENAME.Rows(0).Item("SubmittedIndicator"))

However, when I go to save the data back to the database, the variable contains 'False' and might possibly still should be a NULL value since the user may not have specified its value.

TABLENAME.Rows(0).Item("SubmittedIndicator") = blnSubmitted

I cannot think of a way to ensure when saving the data back to the database that I may need to be saving NULL value, if that is what was passed in.

What is the best way to handle this?
0
Comment
Question by:rogue_1
  • 2
3 Comments
 
LVL 35

Accepted Solution

by:
mrichmon earned 500 total points
ID: 18819422
The best way (if possible) is to use nullable boolean type.  However, I say "if possible" because this is only available in .NET 2.0.  But since you are asking this in the .NET 2 forum, it should be possible for you.

Then using it you have the option to test .HasValue to see if it is null or if it is actually a boolean.  If so then you use .Value to get the bool value out.
0
 

Author Comment

by:rogue_1
ID: 18823781
OK, I will give that a try this weekend and let you know how it turns out.  Thanks
0
 

Author Comment

by:rogue_1
ID: 18838537
Works great.  Thanks for the help
0

Featured Post

3 Use Cases for Connected Systems

Our Dev teams are like yours. They’re continually cranking out code for new features/bugs fixes, testing, deploying, testing some more, responding to production monitoring events and more. It’s complex. So, we thought you’d like to see what’s working for us.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
VB.NET 2013-How to validate a textbox and set focus to next control if true? 4 33
Modal Popup Extender control 1 20
VB.net and sql server 4 35
VB.NET 2008 - SQL Timeout 9 24
Wouldn’t it be nice if you could test whether an element is contained in an array by using a Contains method just like the one available on List objects? Wouldn’t it be good if you could write code like this? (CODE) In .NET 3.5, this is possible…
The ECB site provides FX rates for major currencies since its inception in 1999 in the form of an XML feed. The files have the following format (reducted for brevity) (CODE) There are three files available HERE (http://www.ecb.europa.eu/stats/exch…
This Micro Tutorial will teach you how to censor certain areas of your screen. The example in this video will show a little boy's face being blurred. This will be demonstrated using Adobe Premiere Pro CS6.
Finds all prime numbers in a range requested and places them in a public primes() array. I've demostrated a template size of 30 (2 * 3 * 5) but larger templates can be built such 210  (2 * 3 * 5 * 7) or 2310  (2 * 3 * 5 * 7 * 11). The larger templa…

770 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question