Custom ConfigurationSection

public class PaymentSection:ConfigurationSection
    {
        constant parameters#region constant parameters
        const string VALUE = "value";
        #endregion

        properties#region properties
        [ConfigurationProperty("value"), StringValidator(InvalidCharacters = "")]
        /**//// <summary>
        /// Gets or sets the value of property "value"
        /// </summary>
        public string Value
        {
            get
            {
                return this[VALUE].ToString();
            }
            set
            {
                this[VALUE] = value;
            }
        }
        #endregion
    }