I have a Textbox where you can write a Subject into it and press a button to send the new subject into a database. My combobox shows all subjects in the database and you can choose one and delete it. All programmed with Entity Framework. The Combobox is filled with values during Form.Load-Event.
When I write a new entry in the textbox the combobox has to refresh coz I want the possibility to delete the new entry as well.
I tried
cmb.refresh,
cmb.update
both not working, probably because the code to fill the comboboxes is in the form.load event. So i tried to refresh the form with
me.update
but this is not working too. Any idea how I can update (refill) my combobox?
Okay so take all the code in your Form.load event
Put this code into a new method called UpdateCbo.
Private Sub UpdateCbo()
// your form.load code
End Sub
Then in your form.load event, call this new method.
Public Sub FormLoad(ByVal sender As Object, ByVal e As EventArgs) Handles MyBase.Load
UpdateCbo()
End Sub
Then also if you want the combobox to refresh when you add a new entry, you can either hook UpdateCbo up to a button click event or the textchanged event of your combo box.
e.g:
Private Sub Cbo_TextChanged(sender As System.Object, e As System.EventArgs) Handles cbo.TextChanged
UpdateCbo()
End Sub
How do you fill and bind values to the combobox? You can take that code out into a separate function "fillComboBox", and call that upon filling the textbox.
If you post a code sample I can show you what I mean.
Related
i am making vb.net application in which there are 10 textbox in which i am changing background color when it got focus and lost focus. and adding validation number or character only. is there any way i can set or add custom code that every textbox added in form change color on got focus and lost focus and can assign textbox validation number only, alphanumeric. i don't want to add code on every event on keypress , gotfocus and lostfoucs. i just want to set it as default property of text box
here is my code
Private Sub txtProductDescc_GotFocus(ByVal sender As Object, ByVal e As System.EventArgs) Handles txtProductDescc.GotFocus
txtProductDescc.BackColor = interfaceDesign.gotFocusTxtColor
End Sub
Private Sub txtProductDescc_LostFocus(ByVal sender As Object, ByVal e As System.EventArgs) Handles txtProductDescc.LostFocus
txtProductDescc.BackColor = interfaceDesign.lostFocusTxtColor
End Sub
One way, which I am using myself often, is to make an array of textboxes. This way they all share the same "code" for every event and you can select them by index if you need to address a specific item.
Updated
You can also capture key events on the main form:
C# capture main form keyboard events
How do I capture Keys.F1 regardless of the focused control on a form?
I have created a form that allow users to close a form by clicking anywhere on the enlarged picture form (There are 3 objects to consider) and go back to the other form, which is called: "frmPhone". There's an actual picture on the form: "frmPhonePics" which is what I'm using to accomplish what I'm trying to do (was unable to insert an image on here. Sorry.) What I want to do is write a single click event to close the large picture form to allow the user to close it absolutely anywhere in the form, but I don't know how to do that. Here's the code I have so far:
Private Sub frmPhonePics_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Click
frmPhone.Show()
Me.Hide()
End Sub
It sounds as though you have a picture on your frmPhonePics form. If you double click that (from the VBA editor), you should be taken to the code - for example, you might see
Private Sub Image1_Click()
End Sub
Now all you have to do is add your code there:
Private Sub Image1_Click()
Me.Hide
frmPhone.Show()
End Sub
Note - the order matters, since frmPhone.Show() will "hijack" the code flow until it's dismissed, and in your code Me.Hide will not execute (so the form will not close) until frmPhone has been dismissed.
You can map the click handler for various object to one thing, if that is what you are asking:
Private Sub frmPhonePics_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) _
Handles MyBase.Click, Handles picLarge.Click, Handles otherThing.Click
frmPhone.Show()
Me.Hide() ' should be Me.Close?
End Sub
Not sure why it is MyBase.Click in your code instead of Me.Click. Is this a subclassed form?
I'd strongly suggest using a DoubleClick instead of a single Click. The chances of an errant click doing the wrong thing is very great.
The easiest way is right from the designer. Write the sub routine, then for each control, in the properties window, click the events icon(thunderbolt) and assign the sub routine to the double-click event.
Alternatively, dispense with the Handles clause completely and use a series of Addhandler statements in the Load event handler. If you put a unique string in the names of the controls or if it's all the controls, you can iterate through the controls and use one addhandler statement for all of them
For Each c As Control In Me.Controls
AddHandler c.DoubleClick, AddressOf Ctrl_DoubleClick
Next
Private Sub Ctrl_DoubleClick(sender As Object, e As EventArgs)
'Do stuff
End Sub
This is a VB.NET winforms project, using EF. The ComboBox is bound to a seperate datasource which contains the colums tName and tNumber. TName is a brief description of that value and tNumber is the actual number that is saved in the Financial Table under column named transaction_type. Everything works flawlessly on the display of existing data that is in the Financial Table.
The comboboxes for each item in the grid all show the correct description for the transaction_type. But when ever I change the value of any of the combo boxes and click the save button it does not save any value to the transaction_type.
Any ideas why this might be? Any missing code I will add if required..
The form_load event looks like this:
Private Sub paymentHistoryView_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
FinancialDataGridView.DataSource = db.financials.Where(Function(f) f.TenantId = tenentId).OrderBy(Function(f) f.transaction_date)
TranstypeBindingSource.DataSource = db.transtypes.OrderBy(Function(f) f.tNumber)
BindingNavigatorDeleteItem.Enabled = False
End Sub
And the savebutton click event is as follows:
Private Sub FinancialBindingNavigatorSaveItem_Click(sender As System.Object, e As System.EventArgs) Handles FinancialBindingNavigatorSaveItem.Click
db.SaveChanges()
End Sub
The properties for the ComboBox are shown Below:
It should be noted that all other changes to the datagrid are saved correctly when the save button is clicked... After further testing the value will actually save if the ComboBox is no longer selected. I guess a work around would be to focus on something else after the value of a comboBox is changed. If this seems like the best way how would I hook on SelectedIndexChanged event for comboBoxs in the datagridview???
I think that if you check, the same thing will actually happen with the other columns in the datagridview, if you do not move out of the cell before clicking the save button. The good news is that you only need to add one line of code.
FinancialDataGridView.CommitEdit(DataGridViewDataErrorContexts.CurrentCellChange)
Now your SaveItem_Click event handler should look like this:
Private Sub FinancialBindingNavigatorSaveItem_Click(sender As System.Object, e As System.EventArgs) Handles FinancialBindingNavigatorSaveItem.Click
FinancialDataGridView.CommitEdit(DataGridViewDataErrorContexts.CurrentCellChange)
db.SaveChanges()
End Sub
This will commit the dirty cell before the save.
See https://stackoverflow.com/a/6469559/269123
I have a gridview that is populated and a button outside the gridview that I want to enable editing on the selected row when clicked. I have this in the code behind. What goes in the btn_click event to invoke the grid view editing?
Protected Sub GridView1_RowEditing(ByVal sender As Object, ByVal e As GridViewEventArgs)
GridView1.EditIndex = e.NewEditIndex
FillGrid()
End Sub
Protected Sub btnEdit_Click(ByVal sender as Object, ByVal e As System.EventArgs) Handles btnEdit.Click
What goes here??
End Sub
There is a problem with this approach.
"GridView1_RowEditing" is expecting a row index, so it can turn on "EditItemTemplate" accordingly, correct?
But If you want to click on button outside of Gridview and make entire Gridview editable, you shouldn't trigger GridView1_RowEditing, since you don't know what editindex to pass.
You need to implement editable control(textbox) as part of "ItemTemplate", not in "EditItemTemplate".
And visibility of this control would be controlled by the outside button you have created, which will flag the visibility on / off.
Please review following link, this demonstrates how it should be implemented.
http://highoncoding.com/Articles/219_GridView_All_Rows_in_Edit_Mode.aspx
I have a Visual Studio, Visual Basic form that includes an OK button and a Cancel button.
What I want to do is have the OK button save the options that the user chooses and of course the Cancel button discarding them and returning them to their previous values.
But what I'm noticing is that as I'm debugging the form, the values are being saved regardless of whichever button I'm choosing. On the form's properties, I have declared that indeed the CancelBtn is the CancelBtn and that the OK button is the OK button, but the values are still being saved regardless.
Is there a better way to do what I would like this form to do?
EDIT:
Here's the code so far for the two buttons, both are being set to close the window. AcceptOption should save the values and CancelOption should just close the form. I'm sorry if this isn't done well but the FAQ's that I found only mention changing the properties of each button and nothing about the code.:
Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles AcceptOptionBtn.Click
' Save the Options
Me.Close()
' Close the form
End Sub
Private Sub Button2_Click(sender As System.Object, e As System.EventArgs) Handles CancelOptionBtn.Click
' Close the form
Me.Close()
End Sub
Don't change "the values" until the user clicks the Save button.
The form should be preloaded with a copy of the values you would like to update.
The Cancel button should just close the form.
The Save button should cause "the values", not the forms copy, to be updated.
EDIT:-
In regard to this question, there is nothing wrong with the code you have posted. Are the right handlers being called for the right button clicks? Are the form's AcceptButton and CancelButton properties set to the right buttons?
What data are your editing controls bound to, if at all?
There's nothing magical about OK and Cancel buttons. They're just... buttons. If you save your data every time a change is made, the Cancel button won't magically "unsave" them. Though if you save changes in the OK button's Click event handler, then clicking the Cancel button obviously won't save your changes. To help you further we'd need to know how you save your data.
Edit:
From looking at your code, I think you're passing data directly to your form, without performing a copy of your objects. Therefore if you modify this data, it will also be changed in the parent form. By working with a copy of your data in this form, any changes which aren't saved will be correctly discarded.
Your event handler for the cancel button should look like this:
Private Sub btnCancel_Click(sender As System.Object, e As System.EventArgs) Handles btnCancel.Click
Me.Close()
End Sub
Your event handler for the OK button should look like this:
Private Sub btnOK_Click(sender As System.Object, e As System.EventArgs) Handles btnOK.Click
SaveSettings 'call a routine to save the settings the user has entered
Me.Close()
End Sub
It is as simple as that!
If you open your form like
myForm.showdialog()
you don't have to define the handler for the close button click event, it is automatically handled; just set the 'DialogResult' property for the button
btnCancel.DialogResult = DialogResult.Cancel
Also if you want to close the form when ESC is pressed then set the 'CancelButton' property for the form:
myForm.CancelButton = btnCancel
On the other hand if you open the form like
myForm.Show()
you do need to specify the action(s) to take on the close button click event as indicated here, ie:
Private Sub BtnCancelClick(ByVal sender As System.Object, ByVal e As EventArgs) Handles btnCancel.Click
Close()
End Sub
I was having the same issues. As soon as I use My.Settings.Blabla = Blabla.value, it gets saved even if I haven't used My.Settings.Save() which makes My.Settings.Save() completely pointless as far as I can tell.
I ended up taking up Jordell's advice: Don't change "the values" until the user clicks the Save button but it wasn't too clear for me how to go about it.
I ended up using temporary variables in all my settings subs instead of the user My.Settings.UserConfigs. Only when I was in the OK sub did I call
My.Settings.UserConfigSetting = temporary_UserCofigValue
Here is an example from the code I was working on:
Private Sub btnOptionsThemeLB_Back_Update_Click(sender As System.Object, e As System.EventArgs) Handles btnOptionsThemeLB_Back_Update.Click
If (tempOptionsThemeLB_Back = Nothing) Then
tempOptionsThemeLB_Back = Me.btnOptionsThemeLB_Back.BackColor
End If
tempOptionsThemeLB_Back = RGBToColor(txtbOptionsThemeLB_Back_Red.Text, txtbOptionsThemeLB_Back_Green.Text, txtbOptionsThemeLB_Back_Blue.Text, tempOptionsThemeLB_Back)
Me.btnOptionsThemeLB_Back.BackColor = tempOptionsThemeLB_Back
End Sub
And only withing the Ok sub did I call My.Settings.
'Theme Section
My.Settings.colorBtnBack = tempOptionsThemeLB_Back