CODEWITHSUNDEEP
vb.netwinformscombobox
Hemal Rathod
Hemal Rathod

Reputation: 93

Keyup event fires automatically

In my winforms application for visual studio 2010,

I have a button, and two combobox(combobox1,combobox2).

I have added code in button to clear the previously entered data in first combobox(combobox1) and set focus to it.

In keyup event of first combobox(combobox1), I have checked for enter key, if pressed, focus will move to next combobox(combobox2).

But my problem is, when i press button(by pressing enter while focus is on button), focus is directly moved to last(second) combobox(combobox2).

Keyup event of combobox1 is automatically fired though i have entered on button only

How can i solve this?

My code is give below

Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
    'code to perform database action
    Me.ComboBox1.Focus()
End Sub

Private Sub ComboBox1_KeyUp(sender As Object, e As KeyEventArgs) Handles ComboBox1.KeyUp
    If e.KeyCode = Keys.Enter Then
        If Me.ComboBox1.SelectedText = String.Empty Then
            ComboBox2.Focus()
        End If
    End If
End Sub

Update

When i click on button, problem do not appear But when i press enter while focus is on button, to fire the button click event, problem occurs.

Upvotes: 0

Views: 2273

Answers (1)

Pondidum
Pondidum

Reputation: 11627

The easiest way to fix this is to change ComboBox1 to be a KeyDown handler not key up.

The reason it happens is the sequence of events:

  • Key Down on Button (Enter key)
  • Code runs (Button2_Click), focus moves to ComboBox1
  • Key Up on ComboBox1 fires
  • Code runs (ComboFox1_KeyUp), focus moves to ComboBox2

Edit: A more wordy explanation: You press the enter key down on button1, which causes it's OnKeyDown handler to run. By the time you have released the enter key, focus is on Combobox1, and so it's OnKeyUp handler runs.

Upvotes: 2

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