I am using Visual Studio and working in a Windows Form Application. I have added a Listbox on my form. The problem I am having is that when I run my application I can't add any text or even select the Listbox to put my cursor in.
You have to add values or action to listbox before run it,if you run it without value or action absolutely that will give you nothing.
To add a value in listbox,right click on listbox then select "edit items...".
Or you can make a action like : add text to listbox from textbox,do looping,or another...
From the design window from theToolbox add a TextBox and a Button to your form. (The ListBox is already there, right?) Enter the following code to your form in the code window.
'This is the code that runs when the users clicks the button
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
'This is the code that copies the text in the text box to the list box
ListBox1.Items.Add(TextBox1.Text)
'This code clears the text in the text box
TextBox1.Text = ""
End Sub
The text in the gray window that appears in light gray and is preceded with an apostrophe are comments; not part of the code.
Now run the program and type in the text box. Click the button and the text you typed will appear in the list box. Now that you have had this brief introduction to Visual Basic . NET try searching for a beginners tutorial. Come back when you have some code that you wrote but doesn't turn out as you thought.
Related
vb.net 2012
I have two comboboxes with a DropDownStyle of DropDownList. I am selecting one of the ComboBoxes when the form loads, cboMyBox.Select(). My problem is that when I select (or focus, or selectall) the combobox programmatically it doesn't show the dotted line highlight. When I tab between controls the dotted line highlight shows up just fine. I am filling the combobox with data before selecting it.
How can I get the dotted line highlight to show up when I select the control in the code?
Combobox selected in code but no highlight
Tab to next control and highlight shows
Ctrl+Tab back to initial combobox, hightlight shows
I have done some experiments and it seems that once you have tabbed to any control like a combo box or a text box and later use the Select() or Focus() method, the select box (dotted rectangle) appears in all the combo boxes; even if you didn't tab to all of them previously.
The trick is to tab to some controls with SendKeys when the form opens.
Private Sub Form1_Shown(sender as Object, e as EventArgs) _
Handles Form1.Shown
' Select the control preceding a combo box in the tab order.
textBox1.Select()
SendKeys.SendWait("{Tab}")
SendKeys.SendWait("{Tab}")
' Select the fist control to be selected when form opens.
btnFocus.Select()
End Sub
It works only if the TAB key is sent twice (don't ask me why, maybe a timing issue).
I have a unit converter written in Visual Basic, using Visual Studio 2012. My frmMain_Load event handler is posted below. I am using text boxes, and combo boxes. I have textchanged, and SelectedIndexChanged events set up for both sides of the converter. My problem is that when the form loads it triggers these events, therefore, causing the program to convert empty strings that returns a zero in the text box at the start of the program. I would rather have blank text boxes. Any help or opinions would be greatly appreciated on this matter. Thanks in advance.
Private Sub frmMain_Load(sender As Object, e As EventArgs) Handles Me.Load
Me.Show() ' Creates the onscreen controls so the focus can be set
PopCombo() ' This procedure populates the combo boxes
cboUnitType.SelectedIndex = 0 ' Sets the default selection on the main combo box
txtUnit1.Focus() ' Sets the focus on the first text box
End Sub
Instead of using SelectedIndexChanged, you should use SelectionChangeCommitted in order to respond only if the user is really the one who changed the selections.
And about the textbox event, I would go with Mr. CoDeXeR's option.
A customer of mine is having a problem with a text box. When he clicks on the string in the text box the cursor always jumps to the end of the string. This is a standard VB.net 2005 text box with multi-line true. On my development machine it works correctly. I click in the middle of a string and can edit where I click. Can anyone suggest what is wrong?
He has run the program both under terminal server and locally on his lap top and has the same problem.
TIA,
John
Is it possible to observe the user? For example, the user might be pressing shift-tab when they are past the text-box, and refering to that as "clicking" the text box.
You can always force behavior like:
Private Sub TextBox1_GotFocus(sender As Object, e As System.EventArgs) Handles TextBox1.GotFocus
TextBox1.SelectionStart = 0
End Sub
I Dragged a DataRepeater into my form.
Added a TextBox to the DataRepeaterItem.
Added A button to the form.
Wrote these 2 Lines of Code :
Private Sub Button1_Click(..) Handles Button1.Click
DataRepeater1.VirtualMode = True
DataRepeater1.AddNew()
End Sub
Run Project
Press Add Button
in the textBox Write "1"
Press Add Button
in the textBox Write "2"
Press Add Button
in the textBox Write "3"
Press Add Button
in the textBox Write "4"
Till Here Every Thing is Fine.
Then Scroll data repeater Up
"1" Changes to default TextBox1
Why Does it happen. How can I prevent it from happening.
Thanks in Advance.
The repeater control isn't going to hold all the values by itself. In virtual mode you don't have to use a datasource, but you have to use something. In this example, they used a simple Integer array: VB.NET Repeater Simple Data Binding Without Datasource
I have a small application that displays a listbox under the cursor position when the user uses a shortcut key.
When the user double clicks a selection from the listbox I want to insert that selected text at the curser position of that opened window.
Example: user has microsoft word open. He/she uses a shortcut key that displays a listbox just under the cursor position. The listbox has a collection of text. When the user double clicks a selection that selected text is inserted at the cursor position.
I tried the following:
Private Sub ListBox1_DoubleClick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ListBox1.DoubleClick
Text.Insert(Cursor.Position, ListBox1.SelectedItem)
End Sub
But that doesn't work.
Any help will be sincerely appreciated.
The best (most generic) approaches will be to trick the application into thinking you have entered some text. For example:
Send keypress windows messages for all of the characters you wish to "type" to the target window (e.g. with WM_KEYDOWN or WM_CHAR type messages. Some experimentaiton may be needed to find the approach that works best).
Copy the text onto the clipboard and send a single ctrl+V keypress message to the application. (This will overrite the clipboard and may not work in apps that don't support that key shortcut though)
If you know the specfic application (e.g. MS Word) then you may be able to use application-specific automation (OLE, etc) interfaces to insert text.