How can I copy a block of XML from one document to the other?

Question

I have two dataGridViews that load up an XML file each, I have made it so that you can drag and drop rows in between each of the grids. However at the moment, all that it do

Answer 1

Assume you want to copy block of elements from text1.xml to text2.xml, you can use LINQ to XML, example below assumes copying all entries from text1 to text 2:

  var xDoc1 = XDocument.Load("C:\\text1.xml");
  var xDoc2 = XDocument.Load("C:\\text2.xml");

  var doc1Entries = xDoc1.Descendants("stentry");

  var cloneEntries = doc1Entries.Select(x => new XElement(x));
  xDoc2.Descendants("stentry").Last().AddAfterSelf(cloneEntries);

  xDoc2.Save("C:\\text2.xml");

But you also can use Where method to filter to get part of xml, sample below is to filter using list of indices:

  var filterIndices = new[] {600, 601, 700, 705};

  var doc1Entries =
      xDoc1.Descendants("stentry")
           .Where(x =>         
               filterIndices.Contains(int.Parse(x.Element("index").Value)));

In here, I assume to insert to the last using Last, but if you care about ordering, you can use LINQ on xDoc2 to find correct position, then do insert.