How can I call keyDown event by passing arguments, Winforms Vb.net - vb.net

Question

The Following is a combo box keydown event
Private Sub ComboBox1_KeyDown(sender As Object, e As KeyEventArgs) Handles ComboBox1.KeyDown
If e.KeyCode = Keys.Enter Then
TextBox2.Text = ComboBox1.Text
TextBox2.Focus()
End If
End Sub
I would like to trigger same event from combobox_leave by passing 'enter key' I did as follows but not working, how to achieve this?
Private Sub ComboBox1_Leave(sender As Object, e As EventArgs) Handles ComboBox1.Leave
ComboBox1_KeyDown(Me, Keys.Enter)
End Sub

Answer 1

Why not just extract the method from the actual event?
Private Sub ComboBox1_KeyDown(sender As Object, e As KeyEventArgs) Handles ComboBox1.KeyDown
performAction(e.KeyCode);
End Sub
Private Sub performAction(e as Keys)
If e = Keys.Enter Then
TextBox2.Text = ComboBox1.Text
TextBox2.Focus()
End If
End Sub
Private Sub ComboBox1_Leave(sender As Object, e As EventArgs) Handles ComboBox1.Leave
performAction(Keys.Enter);
End Sub

Answer 2

You could also use the SendKeys.Send Method
When the user leaves the Combobox (like in your example),
You could set back the Focus to the combobox
and then use SendKeys.Send("{ENTER}") to trigger the enter keydown.
much like this:
Private Sub ComboBox1_Leave(sender As Object, e As EventArgs) Handles ComboBox1.Leave
ComboBox1.Focus()
SendKeys.Send("{ENTER}")
End Sub
However this prevents users from focusing to another component. To prevent this, you could use an if statement that if the user clicks or focuses on another component after focusing on the combobox, the user can still "leave" the combobox.
Your kind of approach is not advisable and this leads to a misunderstanding in the part of the user.

Answer 3

try this :
Private Sub ComboBox1_KeyDown(sender As Object, e As
keyEventArgs) Handles ComboBox1.KeyDown
Dim _KeyCode As Short
If e Is Nothing Then
_KeyCode = 13
Else
_KeyCode = Keys.Enter
End If
If _KeyCode = Keys.Enter Then
TextBox2.Text = ComboBox1.Text
TextBox2.Focus()
End If
End Sub
Private Sub ComboBox1_Leave(sender As Object, e As EventArgs)
Handles ComboBox1.Leave
Dim keypress As System.Windows.Forms.KeyPressEventArgs
ComboBox1_KeyDown(sender, keypress)
End Sub