By default make TextBox to accept numeric values only

I referred to StackOverflow post here: How do I make a textbox that only accepts numbers?

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The problem with this style is that I need to add code or a method call to this code in every TextBox's Keypress event.

I want it in a different way. I want to modify the TextBox class itself in such a way that it can be made to accept either a string or a number depending upon criteria, as and when TextBox control is dropped from the ToolBox on the Form.

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Don't create a user control, simply derive a new class from TextBox. Add a new class to your project and get started with code like this:

using System;
using System.ComponentModel;
using System.Windows.Forms;

class NumberBox : TextBox {
    // insert code here
}

After you compile, the new control appears at the top of the toolbox.