How to make a text-box accept only numeric characters?

How to make a text-box accept only numeric charact开发者_StackOverflow社区ers (0-9) ? and give an error Message if it contains any alphabets or symbols.

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You could catch the event KeyDown and check if e.KeyCode is numeric or not and discard it if you want.
Another thing you could try is using IsNumeric(txt.Text).

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This MSDN article will help you:

• How to: Create a Numeric Text Box

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You could use a Regular Expression something like: ^(\d{0,11})(.\d{0,2})?$ This will allow 0-11 digits left of the decimal and 0-2 digits right of the decimal.

If you have Ajax Controls you could use a Filtered Textbox Extender <cc1:FilteredTextBoxExtender id="FilteredTextBoxExtender8" runat="server" TargetControlID="YourTextBox" FilterType="Custom,Numbers" ValidChars="." > </cc1:FilteredTextBoxExtender>

Or you could also try Marco's approach.

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How about this will allow only numeric data and Back space

Under Keypress event

 if ((!char.IsNumber(e.KeyChar)) && !(e.KeyChar == (char)Keys.Back))
        {
            e.Handled = true;
        }

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Here i am with pincode textbox name an pin code and ID as txtPinCode

you just write on top of the code under document function starts lets write this code and check once

$("#<%=txtPincode.ClientID%>").numeric();

thanks akreddy

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If Asc(e.KeyChar) <> 13 AndAlso Asc(e.KeyChar) <> 8 AndAlso Not IsNumeric(e.KeyChar) Then
    MessageBox.Show("Please enter numbers only")
    e.Handled = True
End If