Vb net add item to listbox

• Article
• 09/01/2020
• 2 minutes to read

Items can be added to a Windows Forms combo box, list box, or checked list box in a variety of ways, because these controls can be bound to a variety of data sources. However, this topic demonstrates the simplest method and requires no data binding. The items displayed are usually strings; however, any object can be used. The text that is displayed in the control is the value returned by the object's ToString method.

To add items

1. Add the string or object to the list by using the Add method of the ObjectCollection class. The collection is referenced using the Items property:

   ComboBox1.Items.Add["Tokyo"] comboBox1.Items.Add["Tokyo"]; comboBox1->Items->Add["Tokyo"];

2. Insert the string or object at the desired point in the list with the Insert method:

   CheckedListBox1.Items.Insert[0, "Copenhagen"] checkedListBox1.Items.Insert[0, "Copenhagen"]; checkedListBox1->Items->Insert[0, "Copenhagen"];

3. Assign an entire array to the Items collection:

   Dim ItemObject[9] As System.Object Dim i As Integer For i = 0 To 9 ItemObject[i] = "Item" & i Next i ListBox1.Items.AddRange[ItemObject] System.Object[] ItemObject = new System.Object[10]; for [int i = 0; i AddRange[ItemObject];

1. Call the Remove or RemoveAt method to delete items.

   Remove has one argument that specifies the item to remove.RemoveAt removes the item with the specified index number.

   ' To remove item with index 0: ComboBox1.Items.RemoveAt[0] ' To remove currently selected item: ComboBox1.Items.Remove[ComboBox1.SelectedItem] ' To remove "Tokyo" item: ComboBox1.Items.Remove["Tokyo"] // To remove item with index 0: comboBox1.Items.RemoveAt[0]; // To remove currently selected item: comboBox1.Items.Remove[comboBox1.SelectedItem]; // To remove "Tokyo" item: comboBox1.Items.Remove["Tokyo"]; // To remove item with index 0: comboBox1->Items->RemoveAt[0]; // To remove currently selected item: comboBox1->Items->Remove[comboBox1->SelectedItem]; // To remove "Tokyo" item: comboBox1->Items->Remove["Tokyo"];

1. Call the Clear method to remove all items from the collection:

   ListBox1.Items.Clear[] listBox1.Items.Clear[]; listBox1->Items->Clear[];

See also

I'm using vb.net forms

I'm trying to add items to a listbox one by one from many comboboxes and textboxes

the problem is when i add the second item to the listbox it replace the first one

i want the listbox to keep the first item and add a new one

here is my code

Private Sub Button39_Click[sender As Object, e As EventArgs] Handles Button39.Click ListBox1.Items.Add[ComboBox1.Text.ToString[] & " " & ComboBox2.Text.ToString[] & " " & textbox1.Text.ToString[]]

6

In Visual Basic.Net, items can also be added at runtime using the Add[ ] method. We can apply this method in Visual Basic 2017, Visual Basic 2015, Visual Basic 2013, Visual Basic 2012, Visual Basic 2010 as well as Visual Basic 2008.

The syntax of the Add[] method is as follows:

Private Sub Button1_Click[sender As Object, e As EventArgs] Handles Button1.Click ListBox1.Items.Add[text] End Sub

Example:

Private Sub Button1_Click[sender As Object, e As EventArgs] Handles Button1.Click
     ListBox1.Items.Add[“Apple”]
End Sub

The Output is as shown below:

Besides that, we can also allow the user to add items via a popup input box.

In the following example, we create a variable myitem and then assign a value to myitem via the InputBox function that store the input from the user. We then use the Add[] method to add the user’s item into the listbox. The code is as follows:

Private Sub Button1_Click[sender As Object, e As EventArgs] Handles Button1.Click Dim myitem 'declare the variable myitem myitem = InputBox["Enter your Item"] ListBox1.Items.Add[myitem] End Sub

For more examples, refer to
//www.vbtutor.net/vb2017/VB2017_Lesson6.html

The ListBox represents a Windows control to display a list of items to a user. A user can select an item from the list. It allows the programmer to add items at design time by using the properties window or at the runtime.

Let's create a list box by dragging a ListBox control from the Toolbox and dropping it on the form.

You can populate the list box items either from the properties window or at runtime. To add items to a ListBox, select the ListBox control and get to the properties window, for the properties of this control. Click the ellipses [...] button next to the Items property. This opens the String Collection Editor dialog box, where you can enter the values one at a line.

Properties of the ListBox Control

The following are some of the commonly used properties of the ListBox control −

Sr.No. Property & Description

1	AllowSelection Gets a value indicating whether the ListBox currently enables selection of list items.
2	BorderStyle Gets or sets the type of border drawn around the list box.
3	ColumnWidth Gets of sets the width of columns in a multicolumn list box.
4	HorizontalExtent Gets or sets the horizontal scrolling area of a list box.
5	HorizontalScrollBar Gets or sets the value indicating whether a horizontal scrollbar is displayed in the list box.
6	ItemHeight Gets or sets the height of an item in the list box.
7	Items Gets the items of the list box.
8	MultiColumn Gets or sets a value indicating whether the list box supports multiple columns.
9	ScrollAlwaysVisible Gets or sets a value indicating whether the vertical scroll bar is shown at all times.
10	SelectedIndex Gets or sets the zero-based index of the currently selected item in a list box.
11	SelectedIndices Gets a collection that contains the zero-based indexes of all currently selected items in the list box.
12	SelectedItem Gets or sets the currently selected item in the list box.
13	SelectedItems Gets a collection containing the currently selected items in the list box.
14	SelectedValue Gets or sets the value of the member property specified by the ValueMember property.
15	SelectionMode Gets or sets the method in which items are selected in the list box. This property has values − None One MultiSimple MultiExtended
16	Sorted Gets or sets a value indicating whether the items in the list box are sorted alphabetically.
17	Text Gets or searches for the text of the currently selected item in the list box.
18	TopIndex Gets or sets the index of the first visible item of a list box.

Methods of the ListBox Control

The following are some of the commonly used methods of the ListBox control −

Sr.No. Method Name & Description

1	BeginUpdate Prevents the control from drawing until the EndUpdate method is called, while items are added to the ListBox one at a time.
2	ClearSelected Unselects all items in the ListBox.
3	EndUpdate Resumes drawing of a list box after it was turned off by the BeginUpdate method.
4	FindString Finds the first item in the ListBox that starts with the string specified as an argument.
5	FindStringExact Finds the first item in the ListBox that exactly matches the specified string.
6	GetSelected Returns a value indicating whether the specified item is selected.
7	SetSelected Selects or clears the selection for the specified item in a ListBox.
8	OnSelectedIndexChanged Raises the SelectedIndexChanged event.
8	OnSelectedValueChanged Raises the SelectedValueChanged event.

Events of the ListBox Control

The following are some of the commonly used events of the ListBox control −

Sr.No. Event & Description

1	Click Occurs when a list box is selected.
2	SelectedIndexChanged Occurs when the SelectedIndex property of a list box is changed.

Consult Microsoft documentation for detailed list of properties, methods and events of the ListBox control.

Example 1

In the following example, let us add a list box at design time and add items on it at runtime.

Take the following steps −

• Drag and drop two labels, a button and a ListBox control on the form.

• Set the Text property of the first label to provide the caption "Choose your favourite destination for higher studies".

• Set the Text property of the second label to provide the caption "Destination". The text on this label will change at runtime when the user selects an item on the list.

• Click the listbox and the button controls to add the following codes in the code editor.

Public Class Form1 Private Sub Form1_Load[sender As Object, e As EventArgs] Handles MyBase.Load ' Set the caption bar text of the form. Me.Text = "tutorialspont.com" ListBox1.Items.Add["Canada"] ListBox1.Items.Add["USA"] ListBox1.Items.Add["UK"] ListBox1.Items.Add["Japan"] ListBox1.Items.Add["Russia"] ListBox1.Items.Add["China"] ListBox1.Items.Add["India"] End Sub Private Sub Button1_Click[sender As Object, e As EventArgs] Handles Button1.Click MsgBox["You have selected " + ListBox1.SelectedItem.ToString[]] End Sub Private Sub ListBox1_SelectedIndexChanged[sender As Object, e As EventArgs] Handles ListBox1.SelectedIndexChanged Label2.Text = ListBox1.SelectedItem.ToString[] End Sub End Class

When the above code is executed and run using Start button available at the Microsoft Visual Studio tool bar, it will show the following window −

When the user chooses a destination, the text in the second label changes −

Clicking the Select button displays a message box with the user's choice −

Example 2

In this example, we will fill up a list box with items, retrieve the total number of items in the list box, sort the list box, remove some items and clear the entire list box.

Design the Form −

Add the following code in the code editor window −

Public Class Form1 Private Sub Form1_Load[sender As Object, e As EventArgs] Handles MyBase.Load ' Set the caption bar text of the form. Me.Text = "tutorialspont.com" ' creating multi-column and multiselect list box ListBox1.MultiColumn = True ListBox1.SelectionMode = SelectionMode.MultiExtended End Sub 'populates the list Private Sub Button1_Click_1[sender As Object, e As EventArgs] _ Handles Button1.Click ListBox1.Items.Add["Safety"] ListBox1.Items.Add["Security"] ListBox1.Items.Add["Governance"] ListBox1.Items.Add["Good Music"] ListBox1.Items.Add["Good Movies"] ListBox1.Items.Add["Good Books"] ListBox1.Items.Add["Education"] ListBox1.Items.Add["Roads"] ListBox1.Items.Add["Health"] ListBox1.Items.Add["Food for all"] ListBox1.Items.Add["Shelter for all"] ListBox1.Items.Add["Industrialisation"] ListBox1.Items.Add["Peace"] ListBox1.Items.Add["Liberty"] ListBox1.Items.Add["Freedom of Speech"] End Sub 'sorting the list Private Sub Button2_Click[sender As Object, e As EventArgs] _ Handles Button2.Click ListBox1.Sorted = True End Sub 'clears the list Private Sub Button3_Click[sender As Object, e As EventArgs] _ Handles Button3.Click ListBox1.Items.Clear[] End Sub 'removing the selected item Private Sub Button4_Click[sender As Object, e As EventArgs] _ Handles Button4.Click ListBox1.Items.Remove[ListBox1.SelectedItem.ToString] End Sub 'counting the numer of items Private Sub Button5_Click[sender As Object, e As EventArgs] _ Handles Button5.Click Label1.Text = ListBox1.Items.Count End Sub 'displaying the selected item on the third label Private Sub ListBox1_SelectedIndexChanged[sender As Object, e As EventArgs] _ Handles ListBox1.SelectedIndexChanged Label3.Text = ListBox1.SelectedItem.ToString[] End Sub End Class

When the above code is executed and run using Start button available at the Microsoft Visual Studio tool bar, it will show the following window −

Fill the list and check workings of other buttons −

vb.net_basic_controls.htm