How to Handel decimal places in c#

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I have question like this

in a c# win application it's contain text box called txtQty it has block to enter characters by using following code

C#

if (!char.IsControl(e.KeyChar) && !char.IsDigit(e.KeyChar) && e.KeyChar != '.')
            {
                e.Handled = true;
            }

but user can enter value like this (5...) this input generate an error how to block this

thanks

Posted 6-Dec-12 0:32am

anushikaroshan

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MT_ 6-Dec-12 6:50am

Its not clear what all characters you want to allow ? Your code above is allowing 5... ? Which event you have written this code?

2 solutions

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Programm3r · Answer 1 · 2012-12-06T00:40:00

Solution 1

Hi,

Please have a look at the following:

Working with the MaskedTextBox Control[^]
Masked C# TextBox Control[^]

Kind regards,

Posted 6-Dec-12 0:40am

Programm3r

Jibesh · Answer 2 · 2012-12-10T10:54:00

You can also check for double.tryparse inside your code since you want to accept one decimal place.

C#

if (!char.IsControl(e.KeyChar) && !char.IsDigit(e.KeyChar) && e.KeyChar != '.')
{
  double dblValue;
  e.Handled = double.tryparse(txtQty.Text,out dblValue);
}

this ensures that the value entred in the text box is a valid decimal number and protects from additional ....( dots :))