List<Author> authors = new List<Author>  
{  
    new Author { Name = "Mahesh Chand", Book = "ADO.NET Programming", Price = 49.95 },  
    new Author { Name = "Neel Beniwal", Book = "Jump Ball", Price = 19.95 },  
    new Author { Name = "Chris Love", Book = "Practical PWA", Price = 29.95 }  
};  
// Add more items to the list  
authors.Add(new Author { Name = "Mahesh Chand", Book = "Graphics with GDI+", Price = 49.95 });  
authors.Add(new Author { Name = "Mahesh Chand", Book = "Mastering C#", Price = 54.95 });  
authors.Add(new Author { Name = "Mahesh Chand", Book = "Jumpstart Blockchain", Price = 44.95 });  

//Declaring that its a list
List<string> test = new List<string>(); 
test.Add("Hello")

Array.Resize(ref objArray, objArray.Length + 1);
objArray[objArray.Length - 1] = new Someobject();