By default make TextBox to accept numeric values only

Question

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

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.

Yes you can. For more information please read [User Control.](http://msdn.microsoft.com/en-us/library/system.windows.forms.usercontrol.aspx) — KV Prajapati, Sep 20 '11 at 04:44
just create a user control with any of method in the attached ink. or you can extend the textbox server control and use those methods in the extended control — Chamika Sandamal, Sep 20 '11 at 04:43

score 1 · Accepted Answer · answered Sep 20 '11 at 05:42

1

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.

answered Sep 20 '11 at 05:42

Hans Passant

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Do I need to create this class in the same project or in a new project? – RKh Sep 20 '11 at 14:31
1

Same project. Putting it in another project is okay too but you'll have to make the class *public*. – Hans Passant Sep 20 '11 at 16:29

By default make TextBox to accept numeric values only

1 Answers1