messagebox.show(textbox.text) displays null

Question

Hello :)

I have a textbox in a form which is accessed by another form, and i can't understand why the textbox text is null.

adaugaPolitaRca adaugare1 = (adaugaPolitaRca)Application.OpenForms["adaugaPolitaRca"];
TextBox tb = adaugare1.codClientTxt;
MessageBox.Show(tb.Text);//displays nothing even though i write text in the textbox
Does anybody know what's wrong?

Vulpes · Answer

I can't really understand why doing it like that should make a difference but I'm pleased you've solved it and that it wasn't an antivirus problem :)

Violeta Popa · Answer

I've finally fixed it, in form load event i could read the text from that textbox, so i used a global variable and then used it in celldoubleclick event. Thank you for replying :)

Violeta Popa · Answer

I've disabled my antivirus, and i've tried that line of code too, nothing :(

Vulpes · Answer

There's one possibility that's just occurred to me. Years ago there was a problem with McAfee's antivirus software which caused message boxes not to display anything. They eventually issued a patch for it though you could temporarily fix it by disabling buffer overrun checks in the McAfee console. If you're running an antivirus program, I'd try temporarily disabling it to see whether this could be anything to do with the problem you're currently experiencing.

Vulpes · Answer

Puzzling! Just as an experiment, insert the highlighted line and see if it changes Form2's title to what's in the texbox: adaugaPolitaRca adaugare1 = (adaugaPolitaRca)Application.OpenForms["adaugaPolitaRca"]; TextBox tb = adaugare1.codClientTxt; this.Text = tb.Text; MessageBox.Show(tb.Text)

Violeta Popa · Answer

I don't know exactly what means the main UI thread, but i supposed is the main form, isn't it? If so..this code is not running from the main form. To be more explicit, in the main form i have a button, when i click this button "adaugare1" form is opened, here is the codClientTxt...i write text in that textbox and I have another button in this form, when i click it the code above runs.

Vulpes · Answer

Are you absolutely sure that the text is written to the textbox before that code runs? If you are sure, then is that code running in a different thread to the main UI thread?

messagebox.show(textbox.text) displays null

Answers (7)