i create combobox column on dgv and enabled the .allowusertoaddrows properties.
but everytime i dropdown combobox column, it always add new line or rows on my datagridview..
i've explore stackoverflow and google, but haven't found the solution yet..
but i've come to understanding that everytime dgv combobox column were clicked, it will automatically trigger default event to add new row.
how can i remove this handler
i've got reference from this link, but it didn't worked out for me..
please give me the solution, thanks you.
here's what i've tried
Private Sub dgv_beli_EditingControlShowing(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewEditingControlShowingEventArgs) Handles dgv_beli.EditingControlShowing
If dgv_beli.CurrentCell.ColumnIndex = 3 AndAlso TypeOf e.Control Is ComboBox Then
Dim comboBox As ComboBox = TryCast(e.Control, ComboBox)
RemoveHandler dgv_beli.EditingControlShowing, AddressOf dgv_beli_EditingControlShowing
End If
End Sub
I'm looking to try and create something like the following:
If the user leaves the last textbox (for example let's say TextBox8), then a new textbox is created below textbox8 with the name textbox9. I have this part, but how would I make it so that if textbox9 is left, the same events happen, so on and so forth?
Private Sub TextBox8_LoseFocus(sender As Object, e As System.EventArgs) Handles TextBox8.LostFocus
' Textbox 9 creation code which then creates the next textbox etc.
End Sub
If anybody can offer a better way of doing this sort of thing
You can use AddHandler to add a eventhandler to a control you create at run time
AddHandler TextBox9.LostFocus, AddressOf TextBox8_LoseFocus
I have about 50 radiobuttons on one form and I don't want to create an if statement for each one to detect when one changes, they are not part of a group box. How would I detect if any radiobutton changed and then write the name to another variable?
Put all the radio buttons on a panel and loop through the panels radio button controls, programmatically adding the same event handler for each as described by #Steve. One way I like to handle the event is to assign each radio button an index into its tag property. Then just store any relevant data in a list of objects and access the data for that radio button by pulling out it's corresponding object from the list using its tag. Much easier than doing it by hand.
Edit: Good catch #Neolisk. Updated answer.
You could Always set the CheckedChanged event for all 50 radiobuttons to the same event handler.
This is an example done via code:
Private Sub OnChange(sender As System.Object, e As System.EventArgs)
Dim rb = CType(sender, RadioButton)
Console.WriteLine(rb.Name + " " + rb.Checked.ToString)
End Sub
Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
AddHandler Me.RadioButton1.CheckedChanged, AddressOf OnChange
AddHandler Me.RadioButton2.CheckedChanged, AddressOf OnChange
' and so on .....'
End Sub
I have done this via code and not using the designer to avoid the long add of Handles RadioButton1.CheckedChanged, RadioButton2.CheckedChanged .......
I have a datagridview in winform, in which four columns exists.Out of which 1 comboxcolumn and other three textboxcolumn. I have handeled combobox selected index change properly and it working fine. I handle this on Datagridview_editigControlShowing() event. Now i want to handle other three textboxes keyprees event so user can only enter numeric value. Now i searched on net there are some solution, but when i add another handler in editingControlShowing() method at run time when i click on combobox, it shows error.But when i remove the addHandler for textbox its worked fine.
My Code is look like
Private Sub dgvPurchase_EditingControlShowing(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewEditingControlShowingEventArgs) Handles dgvPurchase.EditingControlShowing
Dim editComboBox As ComboBox = TryCast(e.Control, ComboBox)
If Not editComboBox Is Nothing Then
AddHandler editComboBox.SelectedIndexChanged, AddressOf editComboBox_SelectedIndexChanged
End If
'RemoveHandler dgvPurchase.EditingControlShowing, AddressOf dgvPurchase_EditingControlShowing
End Sub
Now is there any way to handle both of these if so please provide me the solution
So yes I'm very new to creating my own custom events. I can do the basics when I put controls on a form but this one is a little more complex. I have an application that reads in a .TSV and populates a form with controls based on the number of objects it "reads." So for instance: I have a file that contains 10 people objects and my code populates a form with controls for each person. Easy stuff!
Now lets say I have a ComboBox with the items: "Alive", "Deceased", "Unborn". Right next to this I have a textbox for age. Now originally, this textbox is not enabled because the default value for the ComboBox is "Unborn". But lets say when the user selects "Alive", I want that textbox to become enabled so an age can be entered.
Obviously from me asking this and the title of this question, I don't know how to go about doing this. I don't really understand events and I learn by example but the MSDN examples don't quite cut it.
Any help (especially an awesome Step-by-Step guide) would be greatly appreciated.
From what I gather from the comments, you want to add events to a form object that is created at runtime. Use the AddHandler command to the object. Something to the effect of:
AddHandler NameOfFormObject.TypeOfAction, AddressOf HowToHandle
Private Sub HowToHandle(ByVal sender as System.Object, ByVal e As System.EventArgs)
DropDownMenu.enabled = True
End Sub
Doing it this way, you will be able to modify the events of an object created at runtime. In your case, it sounds like you'll want to use the action that Josaph recommended, and end up incorporating both solutions offered, like so
AddHandler ComboBox1.SelectedIndexChanged, AddressOf HowToHandle
Private Sub HowToHandle(ByVal sender as System.Object, ByVal e As System.EventArgs)
If DirectCast(sender, ComboBox).SelectedIndex = 0 'Alive
DirectCast(DirectCast(sender, ComboBox).Tag, TextBox).enabled = True
Else
DirectCast(DirectCast(sender, ComboBox).Tag, TextBox).enabled = False
End If
End Sub
You will want to use the ComboBox_SelectedIndexChanged() event to capture that the combo box item has been changed. At that point, you will need to check to see which combo box item has been selected and make a decision as to whether the TextBox should be enabled or not. Here is an example. Note: This example assumes that "Alive" is the first item in your combobox at the 0 index.
Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs)
If ComboBox1.SelectedIndex = 0 Then 'Alive
TextBox1.Enabled = True
Else
TextBox1.Enabled = False
End If
End Sub
Dynamically generate the combobox and add handler.
Dim cmb as New ComboBox
AddHandler cmb.SelectedIndexChanged, AddressOf ComboBox1_SelectedIndexChanged
Me.Controls.Add(cmb)
I suppose that as you will have 10 comboboxes... in the same way you'll have 10 textboxes.
In that case... once you attach and handle the event as AndyPerfect and Joseph... in that method you will need code something to know which of the Textboxs you need to enable/disable.
First you need to know which combobox triggered the event: this is done using the "sender" parameter. ctype(sender, Combobox) to access the methods and properties of the ComboBox.
Once you know which combo, you need to activate/deactivate the correct textbox.
To accomplish this, you'll need to add a reference to the TextBox in the "TAG" property of the Combobox at the moment of creating it.
Dim txt as new TextBox
Dim cmb as new ComboBox
cmb.Tag = txt
Then... you simple use:
ctype(ctype(sender, Combobox).Tag, TextBox).Enable = true
Here is how I ended up writing it in the end. I appreciate all the help! Thank you!
If DirectCast(sender, ComboBox).SelectedIndex = 2 Then
DirectCast(Me.Controls.Item(DirectCast(sender, ComboBox).Tag), TextBox).Enabled = True
Else
DirectCast(Me.Controls.Item(DirectCast(sender, ComboBox).Tag), TextBox).Enabled = False
End If