All what you need there is in this project.
http://www.mediafire.com/download/fidd3mm85dmq9tb/%281392.03.10%29_Numerical_TextBox_Sample.rar
download this code to learn how to create a Numerical TextBox.
in this Folder there is a NumericalTextBoxes.dll file. you can using this NumericalTextBoxes.dll file in your project and that is enough to create a NumericalTextBox
and set it's Text using Text property and get it's Text using NumericalText property of your NumericalTextBox easily. for more help refer to Form1.cs code in (1392.03.10) NumericalTextBoxSample\NumericalTextBoxSample\Form1.cs or open project by clicking (1392.03.10) NumericalTextBoxSample\NumericalTextBoxSample.sln and run it and see All what you need.
Reza_m_n_65

Two things

One - You should really use the Code Snippet, not discussion Thread for this.

Two - Providing a link is fine but you should really post the code as well.

Also what does your textbox do that a MaskedTextBox doesn't do?

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