how to make a custom textbox

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Hi, i didnt know how to title this question, but i hope it gets viewed by someone that would know how to do this.
So here is what i wanna do:

When form loads, in the text box should be "0.00" written (its ok this part).
But i want when a user types numbers in the textbox, if the number is greater then 999 (4 digits or more) then to add ',' (comma) automatically, for example, if he write 1000 in the textbox to be 1,000.00 if he writes 1000000 to be 1,000,000.00 etc etc. And when he press '.' (dot) to be on the part where he can enter the decimal number (where he can change those 2 zeros)

I wanna do this so i can make a text box where a price of an item can be inserted.

If my question isn't written good, tell me i ll try to be more clear.

Posted 5-Mar-12 6:17am

Xonfused

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Sergey Alexandrovich Kryukov 5-Mar-12 15:59pm

First, you should specify a control type you are using before customization: "TextBox" is not a type, it's a name for few different types in WPF, Silverlight, Forms, ASP.NET. Tag it and give a full type name. The answer could depend on that.
--SA

Perić Željko 6-Mar-12 3:14am

Hello,
try this link

how to formate textbox value .....in window application[^]

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Ed Nutting · Answer 1 · 2012-03-05T06:40:00

Hi there,

Why not use the default NumericUpDown control with 2 decimal places and the ThousandsSeparator set to true. This will add in the regional separator for thousands so you won't need to worry about European dots as separators. E.g.

C#

System.Windows.Forms.NumericUpDown MyUpDown = new System.Windows.Forms.NumericUpDown();
MyUpDown.ThousandsSeparator = true;
MyUpDown.DecimalPlaces = 2;

This will create a box that (if in the UK) contains the following text for the input number 10000.55:
10,000.55
or in Europe 10.000,55

This is a far better solution than a custom text box. To put the currency symbol you want, use a label in front of the NumericUpDown control.

Hope this helps,
Ed