I made this user control to mimic the IP textbox in the Windows TCP/IP settings. It's different than a masked box or just straight custom validation, in that it is actually 4 textboxes that look like 1 textbox.
If you check the TCP/IP settings in Windows, you will see that this is how their box behaves. It works pretty well. Please let me know any comments/suggestions.
Attached is the full source code, and a sample project showing it in action. Since I did not include any compiled code, you need to build the project before you view form1.
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