public RadForm1()
        {
            InitializeComponent();
            this.radMaskedEditBox1.MaskType = MaskType.Numeric;
            this.radMaskedEditBox1.Mask = "n3";

            this.radMaskedEditBox1.ValueChanging+=radMaskedEditBox1_ValueChanging;
        }

        private void RadButton1_Click(object sender, EventArgs e)
        {
            this.Text = this.radMaskedEditBox1.Value + "";
        } 


        private void radMaskedEditBox1_ValueChanging(object sender, CancelEventArgs e)
        {
           e.Cancel = true; 
        }