Dialog form closes unexpectedly

[lotus18]

Hello folks

I have a form with textboxes to input and it is showed as modal form (form 1.showDialog). I created a validation for my form and it should not save unless all the fields are filled up (e.g. MessageBox.Show("Please fill up all the fields", "Unable to save", MessageBoxButtons.OK, MessageBoxIcon.Information). Now, my problem is when I leave blank on one of the textboxes, of course a messagebox will pop up but after that it closes my form. Any suggestions will be greatly appreciated.

BTW, I'm using vb.net

Rey Sean

[r035198x]

Post your validation code.

[lotus18]

Here it is

 If Len(txtTitle.Text) = 0 Then
            MessageBox.Show("Please input course title.", REQUIRED, MessageBoxButtons.OK, MessageBoxIcon.Exclamation)
            txtTitle.Focus()
            Exit Sub
        ElseIf Len(txtDescription.Text) = 0 Then
            MessageBox.Show("Please input course description.", REQUIRED, MessageBoxButtons.OK, MessageBoxIcon.Exclamation)
            txtDescription.Focus()
            Exit Sub
        End If
 

I tried this and it will only work if the form is not in modal.

Rey Sean

[vijayB]

You might have written exit function or exit sub statement after validating the controls.
Try removing those statements.

[lotus18]

You might have written exit function or exit sub statement after validating the controls.
Try removing those statements.

Hi

If I'm not going to add exit sub statement it will just save the new record.

Rey Sean

[vijayB]

Hi

If I'm not going to add exit sub statement it will just save the new record.

Rey Sean

plz check the sub/function in which u have written the above code.
Try code execution with debug points and check out the flow.
if possible share the sub/function code.

[lotus18]

plz check the sub/function in which u have written the above code.
Try code execution with debug points and check out the flow.
if possible share the sub/function code.

I think that there's nothing wrong with my sub procedures. Like what I said on my previous post (post #3) it will only work and its fine when the form is not in modal mode, i want to achieve it with modal.

Rey Sean

[Plater]

Things go a little different in "modal" mode.
Soemtimes buttons get automatically linked to "close" events. If you look at the properties of your form there are like "AcceptButton" and "CancelButton". sometimes those get filled in.
The same thing happens when using MessageBox, since it returns a dialog result, sometimes the return result of THAT is applied to the modal form and the form gets closed.

Also, there should be NO reason for you to have to use exit sub in that situation. Check and use correct if-then-elseif logic. If you really need to, you can apply a state variable to alert you that something has gone wrong.

[lotus18]

Things go a little different in "modal" mode.
Soemtimes buttons get automatically linked to "close" events. If you look at the properties of your form there are like "AcceptButton" and "CancelButton". sometimes those get filled in.
The same thing happens when using MessageBox, since it returns a dialog result, sometimes the return result of THAT is applied to the modal form and the form gets closed.

Yes you are right. I have almost forgotten it.

Also, there should be NO reason for you to have to use exit sub in that situation. Check and use correct if-then-elseif logic. If you really need to, you can apply a state variable to alert you that something has gone wrong.

What do you mean by state variable?

Rey Sean

[Rich B]

An old question, but without a correct answer.

Because this sub is designated as the "Accept button" handler, the designer assigns an "OK" status to the DialogResult automatically for this sub. To exit the sub without closing the dialog, you must change the DialogResult to NONE.

E.g.

If (not validated) Then
  Me.DialogResult = Windows.Forms.DialogResult.None
  Exit Sub
End If