I want to disable a combo box dropdown list from showing in VB.NET and then enable it. How can I do this? The default value of the cbo box should be enabled for typing.
Thanks
After Searching for same to disable combo box in vb .net cant find good answer which help...
so i tried some thing like this
1st thing to do while disabling
combobox1.enabled=false
combobox1.beginupdate
2nd thing to do while enabling
combobox1.enabled=true
combobox1.endupdate
its looks simple and i dont found any problem but i have doubt may it effect any excecution speen or other object
I want to disable a combo box dropdown list from showing in VB.NET and then enable it.
Ok, use the .Visible property....
The default value of the cbo box should be enabled for typing
Oh.... then.
The bad news.
You can't.
The good news.
You simply put a textbox on top of the combobox. When the dropdown should be disable, make the combobox invisible and show the textbox.
'Goodbye Combo
Private Sub HideComboButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles HideComboButton.Click
comboBox.Visible = False
txtBox.Visible = True
End Sub
'Hello Combo
Private Sub ShowComboButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ShowComboButton.Click
comboBox.Visible = True
txtBox.Visible = False
End Sub
Try using the Enabled method eg comboBox1.Enabled = False Tellme how that works out for you
Try using dropdownstyle, simple can be used to remove list by manually closing the list in designer, then u can switch between dropdown and simple to achieve what you need.
Related
I have a DataGridViewButtonCell in my DataGridView and I wanted to set the property Visible to True.
I have tried:
DataGridView1.Rows("number of row i want").Cells("number of cell i want").Visible = True
Unfortunately it says that the property visible is read only.
Here is the code:
Private Sub DataGridView1_CellClick(sender As Object, e As DataGridViewCellEventArgs) Handles DataGridView1.CellClick
'does not work
DataGridView1.Rows(e.RowIndex).Cells(6).Visible = True
End Sub
Does anyone knows how I can achieve this?
Thanks.
There is no actual way to hide a DataGridViewButtonCell. Currently I can only see two options:
Use padding to move the button over as shown here. I will provide similar VB.NET code
Set the Cell to a DataGridViewTextBoxCell and set the ReadOnly property to True
Use Padding:
Private Sub DataGridView1_CellClick(sender As Object, e As DataGridViewCellEventArgs) Handles DataGridView1.CellClick
If DataGridView1.Rows(e.RowIndex).Cells(6).GetType() Is GetType(DataGridViewButtonCell) Then
Dim columnWidth As Integer = DataGridView1.Columns(e.ColumnIndex).Width
Dim newDataGridViewCellStyle As New DataGridViewCellStyle With {.Padding = New Padding(columnWidth + 1, 0, 0, 0)}
DataGridView1.Rows(e.RowIndex).Cells(6).Style = newDataGridViewCellStyle
End If
End Sub
Use DataGridViewTextBoxCell:
Private Sub DataGridView1_CellClick(sender As Object, e As DataGridViewCellEventArgs) Handles DataGridView1.CellClick
If DataGridView1.Rows(e.RowIndex).Cells(6).GetType() Is GetType(DataGridViewButtonCell) Then
Dim newDataGridViewCell As New DataGridViewTextBoxCell
DataGridView1.Rows(e.RowIndex).Cells(6) = newDataGridViewCell
newDataGridViewCell.ReadOnly = True
End If
End Sub
Both of these should give you the effect of not showing the button.
This is really a perspective issue. From a programmer’s perspective, simply ignoring the button clicks on the buttons I want to disable is very easy to do and takes just a few lines of code.
From a user perspective, this situation would play out like this… the user clicks what appears to be a valid enabled button, and nothing happens. The user did not write the code for this… so at best the user will think the computer is not responding to the button click or at the worst… would think your coding skills are dubious!
The same situation happens if the button is missing. The user is not going to know why it is missing… but will most likely come to the same conclusion described above with a non-working button.
In another very simple approach, let say that all the buttons are enabled and we have a list of the button indexes we want to disable. The users presses one of the buttons, we check the disabled button list and if the clicked button is one that is disabled, simply display a message box to indicate why this button is disabled. This approach says to the user… “Here are a bunch of buttons, guess which ones are enabled”…
The DataGridViewDisableButtonCell and DataGridViewDisableButtonColumn wrappers solve all of the above issues… the button is visible so the user wont question where the button went if you set it to invisible and it is greyed out. “Greyed out” is something most users understand and will relieve the user of having to “guess” which buttons are enabled.
You can create a wrapper for two classes: the DataGridViewButtonCell and the DataGridViewButtonColumn.
The link How to: Disable Buttons in a Button Column in the Windows Forms DataGridView Control to the MS example is one I have used before using C#, however there is a VB implementation at the link also.
Below is a picture of the result of using the two wrappers described in the MS link. For testing, the picture below uses the check boxes to left of the button to disable the button on the right.
IMHO, using this strategy is user friendly. If you simply make the button invisible or read only, then the user is possibly going to think your code is messed up and not have a clear understanding of WHY the button is missing or doesn’t work. A disabled button indicates to the user that the button is not available for that item. An option would be to have a mouse roll-over indicating why the button is disabled.
I'm trying to change a textbox text dynamically from another textbox and When i'm writing in the first textbox, the text that i'm writing must appare in the second textbox. but here problem is that i have not contain id or name destination text box Please help!and i have work in vb.net using vs2010
Welcome to StackOverflow. I will assume you're a complete newbie and will try to be as comprehensive as possible.
Right click on the first text box and choose properties. Go to the first property: (Name). This will give you the name of that text box. Now do the same for the second text box. Now, double click on the first text box. You will see two dropdown lists on top of your code window. The one on the left stores controls like textbox, form, etc., and one on the right shows the properties of the control. Select second textbox name from the first dropdown list and select TextChanged from the second dropdown list. You will get something like this:
Private Sub TextBox1_TextChanged(sender As Object, e As EventArgs) Handles TextBox1.TextChanged
End Sub
Now add this to the above subroutine:
Private Sub TextBox1_TextChanged(sender As Object, e As EventArgs) Handles TextBox1.TextChanged
TextBox2.Text = TextBox1.Text
End Sub
I am assuming that your first textbox's name is TextBox1 and second textbox's name is TextBox2. These might be different in your code.
For more details about events, properties, and functions, I recommend you read this article: http://msdn.microsoft.com/en-us/library/ms172576(v=vs.90).aspx. That article is based on Visual Studio 2008 but it is equally applicable for Visual Studio 2010 as well. You will also find additional references and samples on the MSDN Visual Basic site: http://msdn.microsoft.com/en-us/library/vstudio/2x7h1hfk.aspx
Change TextBox1 and TextBox2 with the names of your textboxes:
Private Sub TextBox1_TextChanged(sender As Object, e As EventArgs) _
Handles TextBox1.TextChanged
TextBox2.Text = TextBox1.Text
End Sub
I'm having this issue that should be pretty easy to solve but I just can't seem to figure it out or find an answer yet. I have the following code:
Public Sub NotifyThatValuesChanged(sender As Object, e As EventArgs)
APIUserForm_MAIN.OnSecurityInputValuesChanged()
APIUserForm_MAIN.MessageSender.TabControl.SelectTab(0)
End Sub
So, I'm rasing events when values within txtboxes change, and one of the things I want to do is change tab focus when these values change, which it is doing...but....I don't want the cursor (or focus) to change to the selected tab. I want the cursor/focus to stay where it is at while this event happens, and for the tab selected on this other control to change from (1) to (0).
Thanks for the help!!!!
I don't think it's 100% possible. Try putting the focus back into the textbox:
Public Sub NotifyThatValuesChanged(sender As Object, e As EventArgs)
APIUserForm_MAIN.OnSecurityInputValuesChanged()
APIUserForm_MAIN.MessageSender.TabControl.SelectTab(0)
TextBox1.Select()
End Sub
If multiple controls are calling this method, you can use the sender parameter:
DirectCast(sender, Control).Select()
I believe there is a radio button list control while developing web pages using asp.net but not while developing a windows form.
I am developing a windows form where I need to check the user's gender, weather male or female.
Right now I am setting a global check variable and set it when the button is selected like shown below.
I have placed them within a panel:
Private Sub rbtMale_CheckedChanged(sender As System.Object, e As System.EventArgs) Handles rbtMale.CheckedChanged
gender = "Male"
End Sub
Private Sub rbtFemale_CheckedChanged(sender As System.Object, e As System.EventArgs) Handles rbtFemale.CheckedChanged
gender = "Female"
End Sub
Is there any other better way of doing this check?
You need to create a group using container control (Panel or GroupBox). Add Radio buttons inside the container so when the user selects one radio button within a group, the others clear automatically.
You mean like this one?
Radio Buttons are available in WinForms.
When we click on drop down combobox control in our windows form, it shows the list automatically.
But when we press tab and navigate to that control from keyboard it doesn't shows the list automatically. So in other to show the list automatically on receiving focus what should be done?
Set the DroppedDown property of the combobox equal to true.
Private Sub myComboBox_GotFocus(ByVal sender As Object, ByVal e As System.EventArgs) Handles myComboBox.GotFocus
myComboBox.DroppedDown= true
End Sub
I would like to mention on thing here.
I used Enter event to show Drop down list with DroppedDown=true,
But When I type something in text area of combobox and if i leave the area to next control, entered text is lost.
My combobox is databound.