Using KeyDown Event in VB.NET

KeyDown event is a useful event, it helps you to detect whether the key on the keyword is held down. It’s mainly used for validating text in the textboxes.

To test, place a textbox into your form and write the below code inside the KeyDown event if TextBox (take the properties if TextBox and select events of TextBox from the properties, from the event list you have the open the KeyDown event).

TextBox Properties

TextBox KeyDown Event

When you select the KeyDown event of TextBox, it shows like this:

Private Sub TextBox1_KeyDown(ByVal sender As System.Object, _

                                 ByVal e As System.Windows.Forms.KeyEventArgs) _

                                 Handles TextBox1.KeyDown

    End Sub

The event is being handled is the KeyDown event of TextBox.

ByVal e As System.Windows.Forms.KeyEventArgs

Here e holds the information about what key is pressed on the keyboard by the user.

To check which key is pressed on the keyboard is using the below code

If e.KeyCode = Keys.F1 Then

            MsgBox("Help")

        End If

The complete for the KeyEvent in TextBox

Public Class Form1

    Private Sub TextBox1_KeyDown(ByVal sender As System.Object, _

                                 ByVal e As System.Windows.Forms.KeyEventArgs) _

                                 Handles TextBox1.KeyDown

        If e.KeyCode = Keys.F1 Then

            MsgBox("Help")

        End If

    End Sub

End Clas

More Related Topics:

Move Text from One TextBox to another TextBox

Make Ctrl+A to select all text from TextBox

Make TextBox accepts only integer value

Reactions: