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IP TextBox

, 8 Sep 2005
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An IP textbox control that mimics ip boxes in windows network settings


This simple IP address textbox replaces the lack of an IP box in Windows Forms control. Using the DLL you can just add the control to your toolbox and its use is very similar to a regular TextBox control.

Background (optional)

While writing an application for some end-users, i had the need for a textbox that only took an ip address and performed some validation to make sure the text entered was actually an IP. Since there was nothing readily availible that did what I wanted, I wrote a control that can easily be added to any .NET Windows Form.

Using the code

Using this control is very easy. Just right-click somewhere in your toolbox, then click "Add/Remove Items...". Now browse to the DLL, click OK and the control should now be in your toolbox. The control inherits the standard TextBox in Windows.Forms and overrides the Text property so that you can programmatically set or get the Text value as a string; I also added a method IsValid() which returns true if the Text property falls in the parameters of an actual IP address and false otherwise;

Points of Interest

The control is actually 4 TextBoxs and 3 Labels with "." placed at the appropriate locations. Most validation is done on KeyPress and currently a MessageBox pops up to alert the user of Invalid inputs such as numbers less than 0 or greater than 255.


No history yet, but thinking of being able to turn off the MessageBox warnings. There also is no validation when setting the Text programmatically and an unhandled exception is thrown.


This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

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About the Author

Web Developer
United States United States
No Biography provided

Comments and Discussions

GeneralMy vote of 2 Pinmemberi0018-Jan-12 13:47 
GeneralMy vote of 5 PinmemberDonaldKnuth29-Oct-11 23:45 
GeneralNeed PinmemberHardikasd25-Feb-10 2:23 
GeneralNice PinmemberMember 33287121-Dec-09 1:59 
GeneralNew code update Pinmembersysx19-Nov-09 8:33 
QuestionRegarding IP textbox Pinmemberrajionline20-Sep-07 18:55 
GeneralCheck IP Textbox if it's filled with a ip address PinmemberLuneto_HA20-Mar-07 4:38 
GeneralRe: Check IP Textbox if it's filled with a ip address Pinmemberavramik14-Jun-10 21:20 
GeneralDataBinding Pinmemberjoelthegeek1-Dec-05 6:31 
GeneralMovement needs to be a little better Pinmemberluniv04048-Nov-05 10:26 
GeneralRe: Movement needs to be a little better Pinmemberjoelthegeek1-Dec-05 4:32 
GeneralNice Control ! A little question :doh: PinmemberFredyAlfredo20-Sep-05 3:25 
GeneralRe: Nice Control ! A little question :doh: Pinmembermawnkay27-Sep-05 5:16 
AnswerRe: Nice Control ! A little question :doh: Pinmembermawnkay4-Oct-05 5:44 
GeneralLittle changes PinmemberMansonP15-Sep-05 3:48 
I want to say you did a gr8 job with this control. I only modified 2 little things before including it in my custom control library.
You need to add this to allow navigation between the textboxes with the arrow keys on the keyboard

private void Box1_KeyDown(object sender, KeyEventArgs e)
if (e.KeyCode == Keys.Right)
private void Box2_KeyDown(object sender, KeyEventArgs e)
if (e.KeyCode == Keys.Right)
if (e.KeyCode == Keys.Left)
private void Box3_KeyDown(object sender, KeyEventArgs e)
if (e.KeyCode == Keys.Right)
if (e.KeyCode == Keys.Left)
private void Box4_KeyDown(object sender, KeyEventArgs e)
if (e.KeyCode == Keys.Left)

And I added the Browsable attribute to the Text property to make it available on the property grid

public override string Text

GeneralRe: Little changes Pinmembermawnkay27-Sep-05 5:21 
GeneralRe: Little changes Pinmemberpinquotriot19-Mar-09 13:27 
General2 comments: PinmemberMadHatter ¢8-Sep-05 10:33 
GeneralRe: 2 comments: Pinmembermalharone8-Sep-05 16:23 
GeneralRe: 2 comments: PinmemberMadHatter ¢8-Sep-05 18:25 
GeneralRe: 2 comments: Pinmembermawnkay9-Sep-05 5:41 
GeneralRe: 2 comments: PinmemberMadHatter ¢9-Sep-05 8:33 

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