Add text to string in CheckedListBox if checked?

Question

I am working on a simple To Do List program, the user can type anything in a text box, press the button, and it adds the text as an item to a CheckedListBox. Now I want to add the text "Done" before each item if it is checked, and then remove the text if the user unchecks it.

Code:

 Private Sub MyCbList_ItemCheck(ByVal sender As System.Object, ByVal e As System.Windows.Forms.ItemCheckEventArgs) Handles MyCbList.ItemCheck
    If MyCbList.Items.Item(MyCbList.SelectedIndex) = True Then
        MyCbList.Items.Item(MyCbList.SelectedIndex) = "Done: " + MyCbList.Items.Item(MyCbList.SelectedIndex)
    Else
        MyCbList.Items.Item(MyCbList.SelectedIndex) = MyCbList.Items.Item(MyCbList.SelectedIndex).Replace("Done: ", "")
    End If
End Sub

I can't seem to get it working. I've never dealt with CheckedListBoxes before.

Michael Rodrigues · Accepted Answer · 2013-03-21 22:20:20Z

1

Very close! At the moment, your code is looking to see if the currently highlighted (not checked) item's text = "True".

Instead, we need to examine the ItemCheckedEventArgs parameter that's passed into the method:

Private Sub MyCbList_ItemCheck(ByVal sender As System.Object, ByVal e As System.Windows.Forms.ItemCheckEventArgs) Handles MyCbList.ItemCheck
    If e.NewValue = CheckState.Checked Then
        MyCbList.Items.Item(e.Index) = "Done: " + MyCbList.Items.Item(MyCbList.SelectedIndex)
    Else
        MyCbList.Items.Item(e.Index) = MyCbList.Items.Item(MyCbList.SelectedIndex).Replace("Done: ", "")
    End If
End Sub

answered Mar 21, 2013 at 22:20

Michael Rodrigues

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2 Comments

Matt Over a year ago

Thanks so much for your tidying up of my code. Still learning new things with vb.net. What exactly is the variable "e"?

Michael Rodrigues Over a year ago

Every Form Control Event method in .Net passes in two parameters: "Sender" is the object that is raising the event. e.g. if you have 1000 buttons on your form, "Sender" is the actual button that was clicked, so you don't have to try and guess which button was clicked. "e" is information about the event. So for example, Button.MouseMove would have an "e" parameter containing the mouse's X and Y position. Different events have different "e" parameters, containing interesting information.

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