Solved

Changing Values in a datagridview

Posted on 2011-03-11
2
475 Views
Last Modified: 2012-05-11
I had asked how to check to see if a cell in a datagridview was changed so I could prompt the user if they wanted to save the changes.  The solution was to set the value of a global variable "CellBegin" (which I store as a string) with the cell contents on the begin edit and then compare it on the cell end edit.  It works very nicely for existing rows in the data.  However, as soon as I begin to enter a new record I get the following error message:

Conversion from type 'DBNull' to type 'String' is not valid.

Should I change the variable to something other than a string (variant?).  Or is there a way to recognize this entry is a new record and then bypass the compare?  Hope I'm making sense.
Private Sub DataGridView1_CellBeginEdit(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellCancelEventArgs) Handles DataGridView1.CellBeginEdit
        CellBegin = Me.DataGridView1.CurrentCell.Value
    End Sub

Open in new window

0
Comment
Question by:bhlabelle
2 Comments
 
LVL 17

Accepted Solution

by:
nepaluz earned 500 total points
ID: 35110783
just encapsulate the statement in a try catch and set the CellBegin value to nothing, e.g

Private Sub DataGridView1_CellBeginEdit(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellCancelEventArgs) Handles DataGridView1.CellBeginEdit
   Try
        CellBegin = Me.DataGridView1.CurrentCell.Value
   Catch ex As Exception
        CellBegin = Nothing
   End Try
End Sub
0
 

Author Closing Comment

by:bhlabelle
ID: 35110895
I don't know why, but I always forget to do things in a try catch.  Thank goodness I'm not a real programmer.

Thanks for the help!
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
Get String split 5 48
Showdialog 8 29
Exit the loop 4 37
VB.NET 2008 Populate DataModel with DataTable 36 12
Article by: jpaulino
XML Literals are a great way to handle XML files and the community doesn’t use it as much as it should.  An XML Literal is like a String (http://msdn.microsoft.com/en-us/library/system.string.aspx) Literal, only instead of starting and ending with w…
Microsoft Reports are based on a report definition, which is an XML file that describes data and layout for the report, with a different extension. You can create a client-side report definition language (*.rdlc) file with Visual Studio, and build g…
Windows 10 is mostly good. However the one thing that annoys me is how many clicks you have to do to dial a VPN connection. You have to go to settings from the start menu, (2 clicks), Network and Internet (1 click), Click VPN (another click) then fi…
Learn how to create flexible layouts using relative units in CSS.  New relative units added in CSS3 include vw(viewports width), vh(viewports height), vmin(minimum of viewports height and width), and vmax (maximum of viewports height and width).

867 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

Need Help in Real-Time?

Connect with top rated Experts

17 Experts available now in Live!

Get 1:1 Help Now