Restricting textbox input to numbers in C# [closed]

Answer 1

This may not be the best way, but works ok for WPF TextBox...

    private void textBox1_TextChanged(object sender, TextChangedEventArgs e)
    {
        string originalText = ((TextBox)sender).Text.Trim();
        if (originalText.Length>0)
        {
            int inputOffset = e.Changes.ElementAt(0).Offset;
            char inputChar = originalText.ElementAt(inputOffset);
            if (!char.IsDigit(inputChar))
            {
                ((TextBox)sender).Text = originalText.Remove(inputOffset, 1);
            }
        }
    }