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Editorial Team
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Asked: 2026-06-07T22:52:58+00:00

I have been trying write a Mutually Exclusive CheckBox. There are two checkBoxes in

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I have been trying write a Mutually Exclusive CheckBox.

There are two checkBoxes in a Windows Form. If CheckBox1 is Checked then CheckBox2 should be UnChecked. I have been trying to achive this by handling the CheckedChanged event of the CheckBoxes, but has gone into an infinite loop.

My code snippets below.

Private Sub chkBox1_CheckedChanged(sender As System.Object, e As System.EventArgs) Handles chkBox1.CheckedChanged
    If chkBox2.CheckState = CheckState.Checked Then
        chkBox2.CheckState = CheckState.Unchecked
    End If
    If chkBox1.CheckState = CheckState.Unchecked Then
        chkBox1.CheckState = CheckState.Checked
    End If
End Sub

Private Sub chkBox2_CheckedChanged(sender As System.Object, e As System.EventArgs) Handles chkBox2.CheckedChanged
    If chkBox1.CheckState = CheckState.Checked Then
        chkBox1.CheckState = CheckState.Unchecked
    End If
    If chkBox2.CheckState = CheckState.Unchecked Then
        chkBox2.CheckState = CheckState.Checked
    End If   
End Sub

Does someone have a Solution for this?

EDIT
I am not suppose to use RadioButtons here.

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1 Answer

  1. Editorial Team

    You messed up the checked-changing ifs: each one of your handlers is firing itself, hence the infinite loop.
    This should work:

    Private Sub chkBox1_CheckedChanged(sender As System.Object, e As System.EventArgs) Handles chkBox1.CheckedChanged
    If chkBox1.CheckState = CheckState.Checked And chkBox2.CheckState = CheckState.Checked Then
        chkBox2.CheckState = CheckState.Unchecked
    End If
    If chkBox1.CheckState = CheckState.Unchecked And chkBox2.CheckState = CheckState.Unchecked Then
        chkBox2.CheckState = CheckState.Checked
    End If
End Sub


Private Sub chkBox2_CheckedChanged(sender As System.Object, e As System.EventArgs) Handles chkBox2.CheckedChanged
    If chkBox2.CheckState = CheckState.Checked And chkBox1.CheckState = CheckState.Checked Then
        chkBox1.CheckState = CheckState.Unchecked
    End If
    If chkBox2.CheckState = CheckState.Unchecked And chkBox1.CheckState = CheckState.Unchecked Then
        chkBox1.CheckState = CheckState.Checked
    End If   

End Sub

    This avoids indirect recursion

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