C# Online Compiler | .NET Fiddle

using System;
					
public void quicksort (){
	Console.WriteLine("quick sort");
}

public void mergesort (){
	Console.WriteLine("merge sort");
}

public void bubblesort (){
	Console.WriteLine("bubble sort");
}

public void sortwithStrategy(Action algo){
	algo();
}

sortwithStrategy(quicksort);
sortwithStrategy(mergesort);
sortwithStrategy(bubblesort);

Roslyn 2.0 Compiler; Environment version: 4.0.30319.42000

<?xml version="1.0" encoding="utf-16"?>
<data someattributea="" someattributeb="" someattributec="" ExtraAttr="" xmlns:p1="http://SomeTestNamespace.com" p1:someattributec="namespace attr" />
<?xml version="1.0" encoding="utf-16"?>
<data someattributea="replacement value for Someattributea" someattributec="" ExtraAttr="" xmlns:p1="http://SomeTestNamespace.com" p1:someattributec="namespace attr" />

Testing a list of Data.
<?xml version="1.0" encoding="utf-16"?>
<DataList xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <DataItem someattributea="" someattributeb="" someattributec="" ExtraAttr="" xmlns:p1="http://SomeTestNamespace.com" p1:someattributec="namespace attr" xmlns="https://Test Namespace" />
  <DataItem someattributea="" someattributeb="" someattributec="" ExtraAttr="" xmlns:p1="http://SomeTestNamespace.com" p1:someattributec="namespace attr" xmlns="https://Test Namespace" />
</DataList>
<?xml version="1.0" encoding="utf-16"?>
<DataList xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <DataItem someattributea="" someattributeb="" someattributec="" ExtraAttr="" xmlns:p1="http://SomeTestNamespace.com" p1:someattributec="namespace attr" xmlns="https://Test Namespace" />
  <DataItem someattributea="" someattributeb="" someattributec="" ExtraAttr="" xmlns:p1="http://SomeTestNamespace.com" p1:someattributec="namespace attr" xmlns="https://Test Namespace" />
</DataList>