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        private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
        {
            char[] c = new char[] { ‘1′, ‘2′, ‘3′, ‘4′, ‘5′, ‘6′, ‘7′, ‘8′, ‘9′, ‘0′ };

            for(int i=0;i<c.Length;i++)
            {
                if (e.KeyChar == c[i])
                {
                    e.Handled = false;
                    break;
                }
                else
                {
                    e.Handled = true;
                }
          
            }