Hello,

Easy question from a newbie. I have text boxes which collect users
input and on the click of a button do some calculations and output to
another text box. I need to easily convert the numbers inputted to
int's so I can do the calculations. Also I need to figure out how to
pop up an error box if the charactors entered in those boxes are
anything but numbers. Thanks in advance for helping someone trying to
learn this robust language.

Robert,

There are in C# at least three standard methods for that
The Parse and the Convert

String Parse
http://msdn.microsoft.com/library/en...arseTopic1.asp

Convert.ToInt
http://windowssdk.msdn.microsoft.com.../sf1aw27b.aspx

TryParse
http://msdn2.microsoft.com/en-us/library/f02979c7.aspx

These all are overloaded by the way.

I hope this helps,

Cor



<(E-Mail Removed)> schreef in bericht
news:(E-Mail Removed)...
> Hello,
>
> Easy question from a newbie. I have text boxes which collect users
> input and on the click of a button do some calculations and output to
> another text box. I need to easily convert the numbers inputted to
> int's so I can do the calculations. Also I need to figure out how to
> pop up an error box if the charactors entered in those boxes are
> anything but numbers. Thanks in advance for helping someone trying to
> learn this robust language.
>

In addition, you can block all non-digit characters by handling the
KeyPress event and checking for Char.IsDigit (and Char.IsControl).


On Wed, 06 Sep 2006 05:56:10 +0200, Cor Ligthert [MVP]
<(E-Mail Removed)> wrote:

> Robert,
>
> There are in C# at least three standard methods for that
> The Parse and the Convert
>
> String Parse
> http://msdn.microsoft.com/library/en...arseTopic1.asp
>
> Convert.ToInt
> http://windowssdk.msdn.microsoft.com.../sf1aw27b.aspx
>
> TryParse
> http://msdn2.microsoft.com/en-us/library/f02979c7.aspx
>
> These all are overloaded by the way.
>
> I hope this helps,
>
> Cor
>
>
>
> <(E-Mail Removed)> schreef in bericht
> news:(E-Mail Removed)...
>> Hello,
>>
>> Easy question from a newbie. I have text boxes which collect users
>> input and on the click of a button do some calculations and output to
>> another text box. I need to easily convert the numbers inputted to
>> int's so I can do the calculations. Also I need to figure out how to
>> pop up an error box if the charactors entered in those boxes are
>> anything but numbers. Thanks in advance for helping someone trying to
>> learn this robust language.
>>
>
>



--
Happy Coding!
Morten Wennevik [C# MVP]

in the button _ click event (double click the button to see code), you
write

try {

int num=Convert.toint32(textboxinput.text)
num=num+10; // or plus with else value ...
textboxoutput.text=num.tostring();
}
catch
{
MessageBox.show(" the data input is not in right format");
}




(E-Mail Removed) viết :
> Hello,
>
> Easy question from a newbie. I have text boxes which collect users
> input and on the click of a button do some calculations and output to
> another text box. I need to easily convert the numbers inputted to
> int's so I can do the calculations. Also I need to figure out how to
> pop up an error box if the charactors entered in those boxes are
> anything but numbers. Thanks in advance for helping someone trying to
> learn this robust language.

Hi,

This is trivial to do in 2.0 just use MaskedTextbox instead of a regular
Textbox

In 1.X you can either handley the KeyDown event or modify a protected
property for the later you need to derive from Textbox


--
--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation


<(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Hello,
>
> Easy question from a newbie. I have text boxes which collect users
> input and on the click of a button do some calculations and output to
> another text box. I need to easily convert the numbers inputted to
> int's so I can do the calculations. Also I need to figure out how to
> pop up an error box if the charactors entered in those boxes are
> anything but numbers. Thanks in advance for helping someone trying to
> learn this robust language.
>