Error when textbox empty

Question

I'm using c# winform
I made 1 textbox and 1 label.
I use textchanged event.
I use decimal variabel for textbox.

When i input something in textbox, the label show what i input but when i delete the text in textbox, error message suddenly appear and the program can't run anymore

Answer 1

Txt1_textchanged
{
Decimal a, b, c,d;
b =decimal.parse(txt2.Text)
a = b * numericupdown.value
c = decimal.parse(txt3.text)
d = a - c
Label1.text = d.tostring()
}

Answer 2

r f thank you so much
It's working now

Answer 3

Can you please show us the code you use ?

The textchanged event fires everytime some thing is changed. Even when you are not finished changing.

Please explore this event a bit more using a listbox.

listbox1.items.add(textbox.text)

You wil see that every character is counted as a change.

c
ch
cha
chan
chang
change