C#

var QCViewAllHistValue1 = (from frmlst in cfList
   join viewalllst in QCViewAllBrokerList1
   on new
   {
       val = String.IsNullOrEmpty(frmlst.Section) ? "" : frmlst.Section.Trim().ToUpper(),
       val1 = String.IsNullOrEmpty(frmlst.xFundCode) ? "" : frmlst.xFundCode.Trim().ToUpper(),
       val2 = String.IsNullOrEmpty(frmlst.Period) ? "" : frmlst.Period.Replace("A", "").Replace("E", "").Trim().ToUpper(),
       val3 = String.IsNullOrEmpty(frmlst.Broker) ? "" : frmlst.Broker.Trim().ToUpper()
   }
   equals new
   {
       val = String.IsNullOrEmpty(viewalllst.ViewAllSection) ? "" : viewalllst.ViewAllSection.Trim().ToUpper(),
       val1 = String.IsNullOrEmpty(viewalllst.xFundCode) ? "" : viewalllst.xFundCode.Trim().ToUpper(),
       val2 = String.IsNullOrEmpty(viewalllst.ViewAllPeriod) ? "" : viewalllst.ViewAllPeriod.Replace("A", "").Replace("E", "").Trim().ToUpper(),
       val3 = String.IsNullOrEmpty(viewalllst.ViewAllBroker) ? "" : viewalllst.ViewAllBroker.Trim().ToUpper()
   }

   select new QCHelper()
   {
       Value = viewalllst == null ? string.Empty : (viewalllst.Value == null ? string.Empty : viewalllst.Value),
   }).ToList<QCHelper>();

a. Right click a blank area on the desktop.
b. Left click Personalize, Display settings.
c. In the Monitor window that opens you should see your two monitors. Find out which is which by clicking Identify Monitors.
d. Click and drag the right hand monitor left to the left of the original left monitor and release the drag.
That should change the positions of the two monitors so that the mouse motions should be the way you want them.

inheritance

public abstract class Animal
    {
        private String name;
        private int age;
        private String breed;
        private String furColor;

        public Animal(String name,int age,String breed,String furColor)
        {
            this.name = name;
            this.age = age;
            this.breed = breed;
            this.furColor = furColor;
        }

        public void setName(String name)
        {
            this.name = name;
        }

        public String getName()
        {
            return this.name;
        }

        public void setAge(int age)
        {
            this.age = age;
        }

        public int getAge()
        {
            return this.age;
        }

        public void setBreed(String breed)
        {
            this.breed = breed;
        }

        public String getBreed()
        {
            return this.breed;
        }

        public void setFurColor(String furColor)
        {
            this.furColor = furColor;
        }

        public String getFurColor()
        {
            return this.furColor;
        }

        public abstract void sound();

        public string ToStirng()
        {
            return ("Name: " + getName()
                    +"\n"
                    +"Age: " + getAge()
                    +"\n"
                    +"Breed: " + getBreed()
                    +"\n"
                    +"Fur Color: " + getFurColor());
        }
    }

<pre>public class Cat : Animal
    {
        private String favoriteToy;

        public Cat(String name,int age,String breed,String furColor,String favoriteToy):base(name,age,breed,furColor){
            this.favoriteToy = favoriteToy;

        }

        public void setFavoriteToy(String favoriteToy)
        {
            this.favoriteToy = favoriteToy;
                
        }

        public String getFavoriteToy()
        {
            return this.favoriteToy;
        }

        public override void sound()
        {
            Console.WriteLine( getName() + " is a beautiful cat, he is "  + getAge() + " and he likes to Meow."); 
        }

        public override string ToString() => (base.ToString() +
                    "\n"
                   + "Favorite Toy: " + getFavoriteToy());
    }

static void Main(string[] args)
        {
            Cat C = new Cat("Fluffy",4,"Tabby","Ginger","Mouse");
            Console.WriteLine(value: C.ToString());
            C.sound();
        }