AerolineaFrba.Abm_Aeronave.Baja.esTexto C# (CSharp) Метод

        private Boolean esTexto(TextBox txt)
        {
            String textPattern = "[A-Za-z]";
            System.Text.RegularExpressions.Regex regexTexto = new System.Text.RegularExpressions.Regex(textPattern);

            return regexTexto.IsMatch(txt.Text);
        }