Question

I use the following code.

Collection<MyClass> MyCollection1 = new Collection<MyClass>();
MyCollection.Concat(GetSecondCollcetion());

No matter what function GetSecondCollcetion() returns(Obviously Object of Collection<MyClass>) the MyCollection1 Always Empty. Please Help

Answer 1

Try (if you don’t explicitly need MyCollection to be a variable of Collection<MyClass>:

var MyCollection1 = new Collection<MyClass>().Concat(GetSecondCollcetion());

Alternatively

Collection<MyClass> MyCollection1 = new Collection<MyClass>(GetSecondCollection()); 

Or as @Cine says:

MyCollection.AddRange(GetSecondCollcetion());