Restricting textbox input to numbers in C# [closed]

Answer 1

Not sure if this is the correct way, but it works for me, running it on the TextChanged event TextBox has:

    private void CoordinateValidation(object sender, TextChangedEventArgs e) {
        TextBox inputBox = e.OriginalSource as TextBox;
        inputBox.TextChanged -= CoordinateValidation;
        int caretPos = inputBox.CaretIndex;
        foreach (TextChange change in e.Changes) {
            if (inputBox.Text.Substring(change.Offset, change.AddedLength).Any(c => !ValidChars.Contains(c)) ||
                inputBox.Text.Count(c => c == '.') > 1 ||
                (inputBox.Text.Length > 0 && inputBox.Text.Substring(1).Contains('-'))) {
                inputBox.Text = inputBox.Text.Remove(change.Offset, change.AddedLength);
                caretPos -= change.AddedLength;
            }
        }
        inputBox.CaretIndex = caretPos;
        inputBox.TextChanged += CoordinateValidation;
    }