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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. Some solutions allowed you to enter data before the minus.

validating numeric values in c sharp-16

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...

I need to make sure the user can only enter numeric values within the distance Textbox.

So far, I've checked that the Textbox has something in it, but if it has a value then it should proceed to validate that the entered value is numeric: Here's a solution that allows either numeric only with a minus sign or decimal with a minus sign and decimal point.

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

I first have to type the shiftkey(Key Value=16) to type a digit. And why empty the Text after every error, just as barriegrant1 does? I am creating a calculator form, and need to ensure the user enters a numeric only value (no empty values are valid). The user must enter a numeric value only, and if not a message box should appear. Also is it possible to validate both txtboxes at one, or do I need to enter the same code in both textboxes... Wow, man, consider the poor user who just has typed a long accesscode with one typo in it. I don't know much about the error providor, nor the Validating / Validated events. Would this be placed in in some sort of validating procedure? Text = "" End If End Sub End Class Text Box control has additional functionality that is not found in the standard Windows text box control, including multiline editing and password character masking. Text Box Control The properties like Auto Complete Custom Source, Auto Complete Mode and Auto Complete Source to perform a Text Box that automatically completes user input strings by comparing the prefix letters being entered to the prefixes of all strings in a data source. I have created a form-based program that needs some input validation.Most of the previous answers did not take into account selected text.

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