VB.NET ComboBox Control

The ComboBox control is used to display more than one item in a drop-down list. It is a combination of Listbox and Textbox in which the user can input only one item. Furthermore, it also allows a user to select an item from a drop-down list.

Let's create a ComboBox control in the VB.NET Windows by using the following steps.

Step 1: We need to drag the combo box control from the toolbox and drop it to the Windows form, as shown below.

Step 2: Once the ComboBox is added to the form, we can set various properties of the ComboBox by clicking on the ComboBox control.

ComboBox Properties

There are following properties of the ComboBox control.

Property	Description
AllowSelection	The AllowSelection property takes the value that indicates whether the list allows selecting the list item.
AutoCompleteMode	It takes a value that represents how automatic completion work for the ComboBox.
Created	It takes a value that determines whether the control is created or not.
DataBinding	It is used to bind the data with a ComboBox Control.
BackColor	The BackColor property is used to set the background color of the combo box control.
DataSource	It is used to get or set the data source for a ComboBox Control.
FlatStyle	It is used to set the style or appearance for the ComboBox Control.
MaxDropDownItems	The MaxDropDownItems property is used in the combo box control to display the maximum number of items by setting a value.
MaxLength	It is used by the user to enter maximum characters in the editable area of the combo box.
SelectedItem	It is used to set or get the selected item in the ComboBox Control.
Sorted	The Sorted property is used to sort all the items in the ComboBox by setting the value.

ComboBox Events

Events	Description
FontChanged	It occurs when the property of the font value is changed.
Format	When the data is bound with a combo box control, a format event is called.
SelectIndexChanged	It occurs when the property value of SelectIndexChanged is changed.
HelpRequested	When the user requests for help in control, the HelpRequested event is called.
Leave	It occurs when the user leaves the focus on the ComboBox Control.
MarginChanged	It occurs when the property of margin is changed in the ComboBox control.

Let's create a program to display the Calendar in the VB.NET Windows Form.

ComboBox_Control.vb

Public Class ComboBox_Control
    Dim DT As Integer
    Dim MM As String
    Dim YY As Integer
    Private Sub ComboBox_Control_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        Me.Text = "JavaTpoint.com"
        Label1.Text = "Display Calendar"
        Label2.Text = "Get Date"
        Button1.Text = "Date"
        Button2.Text = "Exit"
        ComboBox1.Items.Add("Date")
        ComboBox1.Items.Add("01")
        ComboBox1.Items.Add("02")
        ComboBox1.Items.Add("03")
        ComboBox1.Items.Add("04")
        ComboBox1.Items.Add("05")
        ComboBox1.Items.Add("06")
        ComboBox1.Items.Add("07")
        ComboBox1.Items.Add("08")
        ComboBox1.Items.Add("09")
        ComboBox2.Items.Add("Month")
        ComboBox2.Items.Add("January")
        ComboBox2.Items.Add("February")
        ComboBox2.Items.Add("March")
        ComboBox2.Items.Add("May")
        ComboBox2.Items.Add("June")
        ComboBox2.Items.Add("July")
        ComboBox3.Items.Add("Year")
        ComboBox3.Items.Add("2016")
        ComboBox3.Items.Add("2017")
        ComboBox3.Items.Add("2018")
        ComboBox3.Items.Add("2019")
        ComboBox3.Items.Add("2020")
    End Sub

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        DT = ComboBox1.Text
        MM = ComboBox2.Text
        YY = ComboBox3.Text
        MsgBox("Month " & MM + vbCrLf + "Year " & YY)
    End Sub

    Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
        End
    End Sub
End Class

Output: