The code sample demonstrates a C# class library that we can use in other applications. The class library exposes a simple class named CSSimpleObject. The process of creating the class library is very straight forward.

using System;
using System.Text;

namespace CSClassLibrary {
    public class CSSimpleObject {
    
        /// <summary>
        /// Constructor
        /// </summary>
        public CSSimpleObject() {
          // Console.Writeline('new object created');
        }

        private float fField = 0F;

        /// <summary>
        /// This is a public Property. It allows you to get and set the value 
        /// of a float field.
        /// </summary>
        public float FloatProperty {
            get { return fField; }
            set {
                // Fire the event FloatPropertyChanging
                bool cancel = false;
                
                if (FloatPropertyChanging != null) {
                    FloatPropertyChanging(value, out cancel);
                }

                // If the change is not canceled, make the change.
                if (!cancel) {
                    fField = value;
                }
            }
        }

        /// <summary>
        /// Returns a String that represents the current Object. Here, we 
        /// return the string form of the float field fField.
        /// </summary>
        /// <returns>the string form of the float field fField.</returns>
        public override string ToString() {
            return this.fField.ToString("F2");
        }

        /// <summary>
        /// This is a public static method. It returns the number of 
        /// characters in a string.
        /// </summary>
        /// <param name="str">a string</param>
        /// <returns>the number of characters in the string</returns>
        public static int GetStringLength(string str) {
            return str.Length;
        }

        /// <summary>
        /// This is an event. The event is fired when the float property is 
        /// set.
        /// </summary>
        public event PropertyChangingEventHandler FloatPropertyChanging;
        
    }

    /// <summary>
    /// Property value changing event handler
    /// </summary>
    /// <param name="NewValue">the new value of the property</param>
    /// <param name="Cancel">
    /// Output whether the change should be cancelled or not.
    /// </param>
    public delegate void PropertyChangingEventHandler(object NewValue, out bool Cancel);
    
}