Number only textbox in asp .net page

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Hi,

I want to create a textbox of class

System.Web.UI.WebControls.TextBox

and want that the user will be able to enter only digits(numbers).

I have searched a lot on this and the only result that I get is either using KeyPressEventArgs and OnKeyPress method which I think is for Windows Form textbox type or it is implemented using Javascript for onkeypress event of the textbox.

I want to know is there any method by which we can make such a textbox using C# only?

I don't want to validate the textbox. I want the user should be able to type only numbers in the textbox.

Thanks in advance

Regards
Abhisek Majumder

Posted 19-Feb-11 5:50am

Abhisek_Majumder

Updated 14-Oct-17 1:43am

RaviRanjanKr

v2

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6 solutions

Solution 4

How about using JavaScript to filter the input.

<input name="myInput" id="myInput" onkeypress="return allowOnlyNumber(event);">

VB

function allowOnlyNumber(evt)
{
  var charCode = (evt.which) ? evt.which : event.keyCode
  if (charCode > 31 && (charCode < 48 || charCode > 57))
    return false;
  return true;
}

Note: In the allowOnlyNumber function, it serves my need, you need to modify it as it suit you.

Posted 20-Feb-11 2:15am

Yusuf

Comments

Espen Harlinn 20-Feb-11 9:11am

My 5, that should work :)

Member 10010993 17-Dec-19 1:47am

Thank You Bro

Solution 2

Yes, we can make our own control.
Refer :
1. http://msdn.microsoft.com/en-us/library/ms229644.aspx#Y100[^]
2. Numeric TextBox[^]
3. Simple Numeric TextBox[^]

Hope this helps.
All the best.

Posted 19-Feb-11 6:12am

Pravin Patil, Mumbai

Comments

Abhisek_Majumder 19-Feb-11 13:06pm

Thanks for the quick response.

But all the three links are modification of System.Windows.Forms.TextBox but i want to work on System.Web.UI.WebControls.TextBox.

I'm not sure but i dont think those methods can be applied to Web Textbox as they are meant for Form Textbox.

Solution 5

<asp:CompareValidator ID="CompareValidator1" runat="server" ControlToValidate="TextBoxPrice" Type="Integer" ErrorMessage="CompareValidator" ForeColor="Red" Operator="DataTypeCheck">Numbers Only are allowed..</asp:CompareValidator>

Posted 9-May-13 8:35am

ALNAJJARALI

Solution 6

for example for numbers in the range 0 to 65535

ASP.NET

<asp:textbox id="tbnumber" runat="server" xmlns:asp="#unknown"></asp:textbox>
<asp:regularexpressionvalidator id="number_RegularExpressionValidator" controltovalidate="tbnumber" runat="server" xmlns:asp="#unknown">
ErrorMessage="insert a number (0 to 65535)" 
ValidationExpression="^(0|(\+)?([1-9]{1}[0-9]{0,3})|([1-5]{1}[0-9]{1,4}|[6]{1}([0-4]{1}[0-9]{3}|[5]{1}([0-4]{1}[0-9]{2}|[5]{1}([0-2]{1}[0-9]{1}|[3]{1}[0-5]{1})))))$" 
ValidationGroup="Validator"></asp:regularexpressionvalidator>

regex autor João Batista Neto

Posted 23-Aug-13 3:37am

cmujicarojas

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Abhinav S · Accepted Answer · 2011-02-19T06:03:00

Solution 1

Will an Ajax solution be of any help to you? If yes, then this[^] might help.

Posted 19-Feb-11 6:03am

Abhinav S

Comments

Abhisek_Majumder 19-Feb-11 13:03pm

Thanks for the reply but I'm trying to avoid javascript/ajax. Currently i can make it work via using javascript

<asp:TextBox ID="textbox1" runat="server" Width="150px" MaxLength="8"
onkeypress="if(event.keyCode<48 || event.keyCode>57)event.returnValue=false;" Enabled="False" >
</asp:TextBox>

But i want to solve it using C# only.

Dave Kreskowiak 19-Feb-11 15:38pm

You cannot do this in C# only. Since ASP.NET code only runs on the server, the only way to do this entirely in C# would be to have a round-trip to theserver on every keystroke. Painfully slow...

Even if you made your own customer TextBox, it would have to use JavaScript on the client end in order to work.

Member 14587636 18-Sep-19 18:48pm

dd

Abhisek_Majumder 19-Feb-11 15:46pm

Okay got it thanks :)

Abhisek_Majumder 19-Feb-11 15:47pm

Still can you tell me the way to do it in C# even if it require server round trips

Espen Harlinn 20-Feb-11 9:10am

Good reply, my 5

Abhinav S 20-Feb-11 10:10am

Thanks.

Md.Alauddin · Accepted Answer · 2011-02-20T01:46:00

Solution 3

You can use RegularExpression Validation on the specific text box...The validation expression will be the following
[0-9]*

Posted 20-Feb-11 1:46am

Md.Alauddin

Comments

Espen Harlinn 20-Feb-11 9:11am

Nice and simple, my 5