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I am using Visual Studio Community 2022 Version 17.0.5 with Net Framework 4.8.04161 and when I first start my program, and load a second form, everything works just fine. If I close the second form, then reload it again, a checkbox doesn't start out with the default method of "Checked - False" like it shows in the Properties window.
The first time I call the form (In the Form Load event), I set the checkbox checked to True. The CheckedChanged event fires and loads a grid. I do what I need to do, close the form. When I reload the form again, why doesn't the checkbox default to False? When the code is run again, I put a breakpoint just before the code that sets the checkbox to true and I noticed that it is already set to true and the event doesn't fire.
As a workaround, I put in the following code and it works, but I shouldn't have to do that.
checkbox.checked = false
checkbox.checked = true
Then it works like planned. Why does this happen?
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Hi @Gary Agoura ,
I did some tests based on your description.
When I open form2 twice, it defaults to false before running to CheckBox1.Checked = True in the load method.
Then the CheckedChanged event is fired.
Can you provide more information such as relevant part of the code to help locate the problem?
Thanks for your reply, but in my application, the second time form2 is opened, the checkbox1_checkchanged event doesn't fire.
I put in the following code:
Private Sub CheckBox1_CheckedChanged(sender As Object, e As EventArgs) Handles CheckBox1.CheckedChanged
If CheckBox1.Checked Then
MessageBox.Show("True")
Else
MessageBox.Show("False")
End If
End Sub
I created a new project this morning with two forms and when loading the second form, I did put a breakpoint on the checkbox1.checked = true and the first time it was False, the second time it was True. Another user posted the answer about 3 hours ago so I implemented his fix and now it works perfectly. I am not sure how your checkbox was true both times, but for me it didn't work.
Probably you are using notations like Form2.ShowDialog, Form2.Checkbox1, etc., which deals with the default instance of Form2 and keeps its properties. Sometimes this is convenient.
To use new forms, replace Form2.ShowDialog with:
Dim f As New Form2
f.ShowDialog()
This will always create a fresh form. But if this requires more changes, you can use your current workaround.