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
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