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VB.Net - KeyPress event
Handle Keyboard Input at the Form Level in VB.NET
Windows Forms processes keyboard input by raising keyboard events in response to Windows messages. Most Windows Forms programs process keyboard input by handling the keyboard events.
How do I detect keys pressed in VB.NET
You can detect most physical key presses by handling the KeyDown or KeyUp events. Key events occur in the following order:
- KeyDown
- KeyPress
- KeyUp
How to detect when the Enter Key Pressed in VB.NET
The following VB.NET code behind creates the KeyDown event handler. If the key that is pressed is the Enter key, a MessegeBox will displayed .
If e.KeyCode = Keys.Enter Then MsgBox("enter key pressd ") End If |
How to get TextBox1_KeyDown event in your VB.Net source file ?
Select your VB.Net source code view in Visual Studio and select TextBox1 from the top-left Combobox and select KeyDown from top-right combobox , then you will get keydown event sub-routine in your source code editor.
Private Sub TextBox1_KeyDown(...).. End Sub |
Difference between the KeyDown Event, KeyPress Event and KeyUp Event in VB.Net
VB.Net KeyDown Event : This event raised as soon as the person presses a key on the keyboard, it repeats while the user hold the key depressed.
VB.Net KeyPress Event : This event is raised for character keys while the key is pressed and then released by the use . This event is not raised by noncharacter keys, unlike KeyDown and KeyUp, which are also raised for vb.net noncharacter keys
VB.Net KeyUp Event : This event is raised after the person releases a key on the keyboard.
VB.Net KeyPress Event
Public Class Form1 Private Sub TextBox1_KeyPress(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress If e.KeyChar = Convert.ToChar(13) Then MsgBox("enter key pressd ") End If End Sub End Class |
VB.Net KeyDown Event
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.Enter Then MsgBox("enter key pressd ") End If End Sub End Class |
How to Detecting arrow keys in VB.Net
In order to capture keystrokes in a VB.Net Forms control, you must derive a new class that is based on the class of the control that you want, and you override the ProcessCmdKey().
Protected Overrides Function ProcessCmdKey(ByRef msg As Message, ByVal keyData As Keys) As Boolean 'handle your keys here End Function |
VB.Net KeyUp Event
The following VB.NET source code shows how to capture Enter KeyUp event from a TextBox Control.
Public Class Form1
Private Sub TextBox1_KeyUp(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles TextBox1.KeyUp
If e.KeyCode = Keys.Enter Then
MsgBox("enter key pressd ")
End If
End Sub
End Class
