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VB.NET Maskedbox Control - Final Release

, 17 Jan 2003
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A very useful maskedbox control using

Sample Image - MaskedBox_Control.jpg


VB.NET does not have a masked texbox and it's very important for user input. So I have made it myself because the components I have found is not good enough for me.


  • The "#" character in the mask is used for digit only
  • The "&" character accepts letter or digit
  • Supported mask symbols are "-", ".", ",", "/", "\", ":"

Using Component

The use of this component is very simple. You have to select the toolbox panel, right click in the windows forms section and select customize toolbox.

Select .NET framework components, then click browse and select maskedbox.dll in the download path. The maskedbox component will appear at the end of windows forms panel. Now select the component and drop it on a form.

Then set the mask property with any combination of valid characters

Ex. ##.###.####-###.###/###


  • Initial - I fixed a bug where the space key is not recognized. This version inherits a textbox component to publish all features of the textbox plus maskedbox
  • 20-jan-2003 Fixes - Function keys now are not handled by control. They cause an invalid character in between the text. The function SetText has been created. Programatically changing the text value in control din't change the masked text, so I created this function where the parameter is a string to fill the text (with no mask). If the text is "", then the text and mask is cleared with a empty mask.
  • 21-jan-2003 - The Final Release!!! I hope! Accept all characters and function keys. The delete key is working now !


Any comments ? Email me at Visit my business site at


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About the Author

Web Developer
Brazil Brazil
Im a 33 years old and work developing applications since 14 years old
COBOL, my first language (i love)
BASIC, i born know
Visual Basic Rock's

Comments and Discussions

GeneralGreat Help - Thanks Pinmembermbusfield26-Nov-06 5:14 
I needed to allow the clearing of a time field so that i can recognise that no time had been entered so i used your code as a starting point and added a few specifics to make it 'time only' and made it a specific format to make it simpler for the user and so i can easily validate the text as a time.
GeneralSuggested enhancements PinmemberVBProEd31-Dec-05 9:45 
JokeRe: Suggested enhancements PinmemberRicardoPDV3-Jan-06 2:45 
Generalmiguelfantastic Pinmembermiguelfantastic27-May-05 14:03 
GeneralProblem in Using this Control Pinmembernamasteall20001-Oct-04 5:21 
GeneralBackspace Bug PinmemberAnAverageJoe9-Jun-04 6:54 
GeneralRe: Backspace Bug PinmemberMrGTI1-Oct-04 5:32 
GeneralRe: Backspace Bug Pinmemberbuffbuh28-Mar-07 13:54 
GeneralAbsolutely Clueless.... PinmemberTheKanuck27-May-04 4:02 
GeneralRe: Absolutely Clueless.... PinmemberXpto00129-Oct-04 19:24 
GeneralPoor Control Load PinmemberMrGTI23-Sep-03 5:30 
GeneralRe: Poor Control Load Pinmembernamasteall20001-Oct-04 5:13 
GeneralBUG Pinmemberbalu_vee14-Aug-03 4:34 
GeneralRe: BUG Pinmembernamasteall20001-Oct-04 5:14 
GeneralOption strict please Pinmembernemaroller30-Apr-03 5:18 
GeneralRe: Option strict please Pinmembernamasteall20001-Oct-04 5:14 
Questionsmall bug ??? Pinmemberzefrit22-Apr-03 8:13 
AnswerHelp me Pinmembernamasteall20001-Oct-04 5:19 
GeneralSmall bug PinmemberRichard Deeming20-Jan-03 4:18 
GeneralRe: Small bug PinmemberRicardoPDV20-Jan-03 6:50 

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