Immideate action after checkbox in datagridview checked in VB.NET 2015

Question

1.00/5 (1 vote)

See more:

Respected members,

I have one simple question. I have search a lot but I don't know why I am not getting correct answer.

my question is, I am having one datagridview in my vb.net windows form. There is checkboxcolumn at the last column (column no 8).I want when user check the checkbox then column no 7's value should transfer into column no 6 and column no 7 value should become 0.

for this I have used :

now Please help me to get my desired output.

thanks in advance.

hope I get my answer soon.

What I have tried:

Option 1 :

VB

If DirectCast(grdInvoices.Rows(e.RowIndex).findcontrol("chkPaid"), checkBox).Checked = True Then
               grdInvoices.Rows(e.RowIndex).Cells(6).Value = grdInvoices.Rows(e.RowIndex).Cells(7).Value
               grdInvoices.Rows(e.RowIndex).Cells(7).Value = 0
           End If

now error is : findcontrol is not member of datagrid view

Option 2 :

If CBool(DirectCast(grdInvoices.Rows(e.RowIndex).Cells("chkPaid").Value, DataGridViewCheckBoxCell).Value) = True Then
grdInvoices.Rows(e.RowIndex).Cells(6).Value = grdInvoices.Rows(e.RowIndex).Cells(7).Value
grdInvoices.Rows(e.RowIndex).Cells(7).Value = 0
End If

now error is : its always fired when I lost focus of checkbox cell after unselect of checkbox

Posted 7-Jun-16 4:37am

Mogha Ritesh

Updated 7-Jun-16 6:54am

Add a Solution

Comments

Sergey Alexandrovich Kryukov 7-Jun-16 12:34pm

The whole idea of FindControl would be wrong. Of course, there is no such thing in System.Windows.Forms.
Your use of hard-coded names like "chkPaid" is also wrong; it leads to totally unmaintainable code.
The solution of your problem is different, I'll explain...
—SA

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Sergey Alexandrovich Kryukov · Answer 1 · 2016-06-07T06:54:00

Please see my comment to the question. You have some serious problems with your code you will need to fix.

Now, capturing of the editing events of the editing control embedded in a cell can be difficult, but DataGridView provides all hooks for doing so. In your case, the problem can be solved in some simper ways. First of all, you can simply handle the event System.Windows.Forms.DataGridView.CellEndEdit:
DataGridView.CellEndEdit Event (System.Windows.Forms).

In the handler method, you can check up the value of the cell: DataGridViewCell.Value Property (System.Windows.Forms).

You case is very simple: if the editor is the check box, it means that the type of the value is Boolean, so you can bravely type-case the property DataGridViewCell.Value value to Boolean and act depending of the value.

If, by some reason, you need to know the combination of the values before and after cell value modification, you can also handle the event DataGridView.CellBeginEdit:
DataGridView.CellBeginEdit Event (System.Windows.Forms).

In the simple case of check box cells, you always change from False to True or from True to False, but the user also can leave the value unchanged.

In more complicated cases, you may also need to use the events DataGridView.EditingControlShowing, DataGridView.EditModeChanged, property DataGridView.EditingControl, and so on. Please review all the DataGridView members related to editing; they are very well described in MSDN:
DataGridView Class (System.Windows.Forms).

One big warning to everyone: the editing control of the same is reused by DataGridView. You have to make sure that you add event handler to the control instance only once. You have to check up that the events handles are already added to the invocation list of the event instances of the same instance of the control and then not add the handlers again. Failure to check it up will result in a memory leak. This is one of the relatively rare cases of the memory leak possibilities in managed memory.

—SA