using System;

using System.Collections.Generic;               

public class Program

{

    public static void Main()

    {

           List<miniClass> miniClassList = new List<miniClass>();

            miniClassList.Add(new miniClass(2.0, 3.0, 1));

            miniClassList.Add(new miniClass(2.0, 3.0, -1));

            miniClassList.Add(new miniClass(2.0,3.0,-1) );

                    Console.WriteLine("Items Count before delete {0}" , miniClassList.Count);

            miniClassList.RemoveAll(x => x.NumRect == -1);

        Console.WriteLine("Items Count after delete {0}" , miniClassList.Count);

    }

     public class miniClass

        {

​

            double pointX, pointY;

            int numRect;

            public miniClass(double x, double y, int numRect)

            {

                pointX = x;

                pointY = y;

                this.numRect = numRect;

            }

            public int NumRect

            {

                get

                {

                    return numRect;

                }

                set

                {

                    numRect = value;

                }

            }

        }

}