Compare two textbox in c#

Question

How can I compare two textboxes in c# using greater than or less than. Im working on billing system. I want the cash shoould be bigger than the total. if not. it will pop up messagebox for error. I already try convert to int. to double. to string. Here's my current code right now.

if (txtCash.TextLength < txtTotal.TextLength){
    MessageBox.Show("Cash must me bigger than the        total");
    txtCash.Focus();
    return;
  }

Any one can help me how? I know text length is wrong. but im just using it.

even though we can do it, you first have to provide what you have tried. — Ousmane D., Mar 11 '17 at 13:48

score 0 · Answer 1 · edited May 23 '17 at 12:02

0

I'm working on billing system. I want the cash should be bigger than the total. if not. it will pop up message box for error.

You might be looking for something like this:

if (double.Parse(txtCash.TextLength) <= double.Parse(txtTotal.TextLength))
{
    MessageBox.Show("Cash must me bigger than the total");
    txtCash.Focus();
    return; // i dont know why you put this here but i'll leave it there anyway.
}
else
{
    var amount = double.Parse(txtCash.TextLength);
    // DO something
}

You may want to further validate the user input if you wish. Example, if the user doesn't enter numbers...

Better ways to achieve your task in the most robust way possible, you should consider the below links:

How do I make a textbox that only accepts numbers?

double.TryParse(...)

Update:

Seems, you're not sure about the keyword var. I suggest you have a deep read of the MSDN reference page for var.

edited May 23 '17 at 12:02

Community

1
1

answered Mar 11 '17 at 14:02

Ousmane D.

54,915
8
91
126

What's the use of var amount? hehe – Fritz Jimenez Mar 11 '17 at 14:09
Didnt work :/ it says double.Parse(String) has some invalid arguments. btw, I already get the idea in else. hehe – Fritz Jimenez Mar 11 '17 at 14:13
that's explanatory. I have also attached few links to help you out further. – Ousmane D. Mar 11 '17 at 14:15

Compare two textbox in c#

1 Answers1