Validating numeric values in c sharp

// From PHP documentation for is_numeric // ( // Finds whether the given variable is numeric. Examples: Pull in a reference to Visual Basic in your project and use its Information.

validating numeric values in c sharp-60

Validating numeric values in c sharp how long to wait before dating

It can contain only unformatted text in its Text property.

In many situations you need to enter only numeric values in the Textbox.

Here you can see some useful techniques that accept only numbers in the textbox.

You can use Regular Expression to validate a Textbox to enter number only.

I also wanted to ensure it returned false if the string was empty or null.

Try Parse returns true in this case (an empty string does not cause an error when parsing as a number). " ")$" ); static bool Is Numeric( string value ) method twice which of course isn't as efficient, but not everything has to be fully optimized, sometimes convenience is just more important.

So, here's my string extension method: The optional 'culture' parameter can be used in much the same way. 0777) notation is allowed too but // only without sign, decimal and exponential part. This method can also be used to easily parse a list of numeric strings into a list of method and it also lets you specify a default value to return if the conversion fails.

It is limited by not being able to convert strings that are too big to be contained in a double, but that is a limited requirement and I think if you are working with numbers larger than this, then you'll probably need additional specialised number handling functions anyway. static readonly Regex _is Numeric Regex = new Regex( "^(" /*Hex*/ @"0x[0-9a-f] " "|" /*Bin*/ @"0b[01] " "|" /*Oct*/ @"0[0-7]*" "|" /*Dec*/ @"((?! This is better than using the ternary operator with the extension method above as it only does the conversion once, still uses reflection though...

Is there something the is preventing me from entering double digits as well as decimals...thanks This doesn't work on my keyboard.

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