Windows Phone Developers

Tuesday, July 29, 2008

VB.NET Controls - DomainUpDown Example

DomainUpDown Control in VB.NET


The Windows Forms DomainUpDown control looks like a combination of a text box and a pair of buttons for moving up or down through a list. The control displays and sets a text string from a list of choices. The user can select the string by clicking up and down buttons to move through a list, by pressing the UP and DOWN ARROW keys, or by typing a string that matches an item in the list. One possible use for this control is for selecting items from an alphabetically sorted list of names. (To sort the list, set the Sorted property to
true.) The function of this control is very similar to the list box or combo box, but it takes up very little space.

The key properties of the control are Items, ReadOnly, and Wrap. The Items property contains the list of objects whose text values are displayed in the control. If ReadOnly is set to false, the control automatically completes text that the user types and matches it to a value in the list. If Wrap is set to true, scrolling past the last item will take you to the first item in the list and vice versa. The key methods of the control are UpButton and DownButton.

This control displays only text strings. If you want a control that displays numeric values, use the NumericUpDown control.

Here is the way to add items in the control

Sub Add_Cities_To_DropDown()

DomainUpDownSource.Items.Add("Tokyo")

DomainUpDownSource.Items.Add("Moscow")

DomainUpDownSource.Items.Add("Chennai")

DomainUpDownSource.Items.Add("New York")

DomainUpDownSource.Items.Add("London")

DomainUpDownSource.Items.Add("Paris")

DomainUpDownSource.Sorted = True

DomainUpDownSource.ReadOnly = True

End Sub

Selected Items can be retrieved through Text property:

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

Dim sBoardingCity As String

Dim sDestnCity As String

sBoardingCity = DomainUpDownSource.Text

sDestnCity = DomainUpDownDestn.Text

End Sub






SelectedItemChanged event can be trapped to dynamically generate output based on selected text

Private Sub DomainUpDownSource_SelectedItemChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles DomainUpDownSource.SelectedItemChanged

GetDestination(DomainUpDownSource.Text)

End Sub

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