C#: i need the Textbox to allow integer only

Annon777 · #1 06-Jun-2008, 04:38

guys,

I'm building an ASP .net webpage using Microsoft Visual C#. I have a textbox, a label and a command button. I need to make an error checking code so that the textbox only allow integers to be entered into it. But it should be checked when the command button is clicked which then the error should be displayed using the label..

Is there any specific commands/keywords i need to use?

netnut · #2 09-Jun-2008, 01:01

I don't know of any in built mechanism for it but you may try by casting the text in the text box to an int. And then catch the exception if and when it occurs. Putting the code in the event handler for the button would solve the purpose.

Netnut.

erniegerdie · #3 16-Jun-2008, 10:11

Aaron you should look at using a RegularExpressionValidator. The validator is placed on the ASPX page, you indicate which control you are validating with the ControlToValidate property

Something like this:

Code:

                <asp:RegularExpressionValidator id="RegularExpressionValidator1" 
                     ControlToValidate="TextBox1"
                     ValidationExpression="^\d+$"
                     Display="Static"
                     ErrorMessage="value must be an integer"
                     runat="server"/>

On your button you would set the CausesValidation property to true.

Code:

 <asp:Button ID="SomeButton"
                    Text="Submit"
                    CausesValidation="True"
                    runat="server"/>

I wouldn't suggest handling exceptions for this. Exceptions are expensive, only use exception handling where it is necessary.

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C#: i need the Textbox to allow integer only

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