[C#] Format spécial

Effectivement mon erreur provient du fait que je testais dans le bloc if. Pour les parenthèse c'est ce que je pensais car cela ne faisait pas la différence lorsque je les enlevais. Cependant j'aimais mieux demander car on ne sais jamais :)

Bob -> Je te conseil vivement d'utiliser le unsercontrol que nous te proposons.

Voici les dernier modif :
Code:
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using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Globalization;
using System.Windows.Forms;
 
namespace PrestigeGestion
{
    public class NumericTextBox : TextBox
    {
        private const int WM_PASTE = 0x0302;
 
        protected override void WndProc(ref Message msg)
        {
            switch (msg.Msg)
            {
                case WM_PASTE:
                    // received a paste event, handle it here
                    HandlePasteData();
                    break;
                default:
                    // let the event continue its way
                    base.WndProc(ref msg);
                    break;
            }
        }
 
        protected override void OnKeyPress(KeyPressEventArgs e)
        {
            char c = e.KeyChar;
            // Char.IsControl let Copy/Paste pass
            if (Char.IsControl(c) || IsValidChar(c))
            {
                base.OnKeyPress(e);
            }
            else
            {
                // suppress the key press
                e.Handled = true;
            }
        }
 
        private void HandlePasteData()
        {
            // retrieve clipboard data 
            IDataObject clipboard = Clipboard.GetDataObject();
 
            // check if the clipboard contains text data
            if (clipboard.GetDataPresent(DataFormats.Text))
            {
                string copyStr = (string)clipboard.GetData(DataFormats.Text);
 
                // clean the text from unwanted characters
                copyStr = RemoveUnWantedChars(copyStr);
 
                // initializes a StringBuilder with ...
                StringBuilder sb = new StringBuilder();
                // ... the text before the selection ...
                sb.Append(Text.Substring(0, SelectionStart));
                // ... the cleaned text ...
                sb.Append(copyStr);
                // ... and the text after the selection
                sb.Append(Text.Substring(SelectionStart + SelectionLength));
 
                // truncate the text length to MaxLength of the TextBox
                sb.Length = Math.Min(sb.Length, MaxLength);
 
                // mimics the paste behavior for windows TextBox : the caret is moved after the pasted data
                int newSelStart = SelectionStart + copyStr.Length;
                // set the nex text
                Text = sb.ToString(); ;
                // ensure the caret is not after MaxLength, to avoir ArgumentOutOfRangeException
                SelectionStart = Math.Min(newSelStart, MaxLength);
 
                // no selection
                SelectionLength = 0;
            }
        }
 
        private static string RemoveUnWantedChars(string s)
        {
            StringBuilder sb = new StringBuilder();
            foreach (char c in s)
            {
                if (IsValidChar(c))
                {
                    sb.Append(c);
                }
            }
            return sb.ToString();
        }
 
        private static bool IsValidChar(char c)
        {
            if (Char.IsDigit(c))
            {
                return true;
            }
            else if (c == ',' || c == '.')
            {
                return true;
            }
            else
                return false;
        }
    }
}