Re: Input validation

Hi Gabriel,

Basically there are two ways you could follow. Assuming you have to
validate a string which should be a representation of a double:

a) Use a CompareValidator [1], setting the Operator property [2] value
as DataTypeCheck and the Type property value as Double. This solution
involves writing not a line of code... The only drawback is it would be
not so easy to deal with globalization issues: in fact, this control
would parse the target string with the culture information of the
current thread (or with a neutral culture, if the control is properly
instructed to do so).
b) Implement your own CustomValidator [3] and attempt to parse the
validation property of the target control via, for example,
System.Double.TryParse(). Naturally this one gives you the greatest
control over the validation logic; since you have to implement this
logic, you can, for example, parse the target string with a given
culture information, thus overcoming the limitations of the former.

[1] http://msdn2.microsoft.com/en-us/library/db330ayw(VS.71).aspx
[2]
http://msdn2.microsoft.com/en-us/library/system.web.ui.webcontrols.validationcompareoperator.aspx
[3]
http://msdn2.microsoft.com/en-us/library/system.web.ui.webcontrols.customvalidator.aspx

Hope this helps.

--
Efran Cobisi
http://www.cobisi.com

Gabriel wrote:
>> Go to ajax.asp.net, scroll down the page and click on "watch more
>> asp.net ajax videos" and watch #13 (How Do I: Use the ASP.NET AJAX
>> Client Library Controls), use regexp to check for a valid number
> and without Ajax ?
>
> Thanks,

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