Improve company productivity with a Business Account.Sign Up

x
?
Solved

Handle DBNull that is a boolean

Posted on 2007-03-29
3
Medium Priority
?
528 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 2000 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

Get expert help—faster!

Need expert help—fast? Use the Help Bell for personalized assistance getting answers to your important questions.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

More often than not, we developers are confronted with a need: a need to make some kind of magic happen via code. Whether it is for a client, for the boss, or for our own personal projects, the need must be satisfied. Most of the time, the Framework…
This article shows how to deploy dynamic backgrounds to computers depending on the aspect ratio of display
If you are looking for an automated tool which can generate reports for Outlook emails and other items from PST file, then you can go for Kernel PST Reporter tool. The reports which are created by this tool are helpful to analyze and understand PST …
Go through the video which explain the procedure to export Amazon WorkMail single or multiple mailboxes to Outlook with Kernel Export Amazon WorkMail to PST tool. User can see the simple steps to export. It has salient features like filters (Include…

587 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