The text of TextBox1 is empty.
Apart from checking (ticking) the NumbersOnly property of TextBox1 in the Designer, in your code, before you handle math operations with the TextBox, you should ensure that the text of TextBox1 is a number. Empty texts are not numbers. Change the text to 0 if it is not a number, then do the calculations.
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Gordon_Lu : it’s already 0 & Number.
No.
Add all textbox text 0
That’s what I said…
sorry i didn’t see him
load data through a timer. Your data is not loading.
It’s just an arithmetic that starts after selecting an Element from spinner’s Elements … it doesn’t need time.
Add if condition not = textbox text empty
Where do I put this block before or after the equation?
Add this block before
** 
** sucecessss thank you ** **
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