How to copy only numbers from masked textbox to a label?

Question

I made a masked textbox for saving numbers with the mask (999) 000-0000 and I want to show only numbers in label but when I do that, it also copies the parantheses and lines.
I know it copies all the text. How I can only copy numbers entered not with mask? (windows form)

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication3
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            label1.Text = maskedTextBox1.Text;
        }
    }
}

Answer 1

One solution is to set TextMaskFormat to ExcludePromptAndLiterals just before reading it's value:

maskedTextBox1.TextMaskFormat = MaskFormat.ExcludePromptAndLiterals;
Console.WriteLine(maskedTextBox1.Text); 
//will print 3123 when value in the mask textbox is (31) 23 for mask (00) 00

And after this set Format back:

maskedTextBox1.TextMaskFormat = MaskFormat.IncludeLiterals;

Even if you won't set format back to IncludeLiterals, UI control still would show masked text (31) 23 and will work as usual. This is done if your other logic relies on masked Text field.

So if you don't have such dependencies, you can set this value right in the Visual Studio designer in properties window for maskedTextBox1