Clever Geek Handbook

How to calculate values ​​on textchanged event?

I tried on textchanged event

decimal a1 = Convert.ToDecimal(0.00);
decimal b1 = Convert.ToDecimal(0.00);
decimal c1 = Convert.ToDecimal(0.00);
a1 = Convert.ToDecimal(txt_Advance.Text.Trim().ToString());
b1 = Convert.ToDecimal(txtTotal.Text.Trim().ToString());
c1 = b1 - a1;
txt_Net.Text = c1.ToString();

This only works once when I change the value again. It gives wrong format error in txt_Advance.text

+3


source to share


1 answer


You need to use the method TryParse

. What actually happens is that when you enter

value something, it parses correctly. But when you click backspace

, that value is removed and textbox

becomes empty

, so trying to convert empty string into decimal

gives format exception

.

Either you can use the method TryParse

, or you can check that if the value textbox

is equal not empty

to convert

, it matches the value decimal

.

decimal.TryParse(txt_Advance.Text.Trim().ToString(),out a1);


OR

if(!string.IsNullOrEmpty(txt_Advance.Text.Trim().ToString()))
  a1 = Convert.ToDecimal(txt_Advance.Text.Trim().ToString());
+4


source






More articles:


All Articles