Sum Total of two TextBox

How to add the following TextBox?

txtTotal.Text = txtTotal.Text + txtTop.Text;

+ doesn't work...
Whing Dela CruzAsked:
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käµfm³d 👽Commented:
Pass a "format string" to the ToString call:

...

txtTotal.Text = (decTotal + decTop).ToString("#,##0.00");

...

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The #'s mean an optional field in the output; the 0's mean a mandatory digit in the output (i.e. if there's no valid digit to fill that position in the original value, then a zero is output for that position). If your sum were .2, then you would see 0.20 in the output. If the sum were 2000, then you would see 2,000.00 in the output.

I go here for my format strings:  http://blog.stevex.net/string-formatting-in-csharp/
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käµfm³d 👽Commented:
You must convert the textual values to a numeric type in order to perform arithmetic on them. I typically suggest using one of the TryParse methods for this because you get validation that the values actually represent numbers before trying to work arithmetic against them. For example:

decimal decTotal = 0;
decimal decTop = 0;

if (decimal.TryParse(txtTotal.Text, out decTotal) &&
    decimal.TryParse(txtTop.Text, out decTop))
{
    txtTotal.Text = (decTotal + decTop).ToString();
}
else
{
    MessageBox.Show("Invalid value(s)!");
}

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Whing Dela CruzAuthor Commented:
Thanks a lot Kaufmed, you gave perfect solution which I spent a lot of time... but could you extent your help? I need to have format for this like this 12,440.83
0
 
Whing Dela CruzAuthor Commented:
Fast and Perfect... Thanks a lot!
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