C#

abstract class BusinessObject
{
	public abstract EntityType Entity
	{
		get;
		set;
	}
}

AndrusM wrote:

after changing virual to abstract but got error

Error 1 The modifier 'abstract' is not valid on fields. Try using a property instead.

I have seen code using virtual properties in applications.
I'm unable to figure out why this code is not working.

public abstract EntityType Entity;

public class BaseClass
{
    private int someValue = 42;
 
    public virtual int SomeValue
    {
        get
        {
            return someValue;
        }
    }
}

public class DerivedClass : BaseClass
{
    public override int SomeValue
    {
        get
        {
            // Um, do something here...
 
            return base.SomeValue;
        }
    }
}

public abstract class BaseClass
{
    public abstract int SomeValue
    {
        get;
    }
}

public class DerivedClass : BaseClass
{
    private int someValue = 42;
 
    public override int SomeValue
    {
        get
        {
            return someValue;
        }
    }
}

public virtual EntityType Entity { get { return _entityType; } set { _entityType = value; }}

public abstract EntityType Entity { get; set; }

wrote:

what is meant by desktop application?????

Christian Graus wrote:

Please, please, please, STOP asking questions over and over. Answer the people who respond to you, on the same thread

shyagam wrote:

I always thought that asynchronous execution means executing an operation on a new thread. Is that true?
If so, how could an operation be executed "asynchronously on the thread that the control's underlying handle was created on"?

shyagam wrote:

And one more... Should I use Control.EndInvoke() even if I've no need for the returned value?

shyagam wrote:

Executes a delegate asynchronously on the thread that the control's underlying handle was created on.