GroupDocs.Meger-for-.NET_ChangePageOrderInDiagrams.cs

// For complete examples and data files, please go to https://github.com/groupdocs-merger/GroupDocs.Merger-for-.NET
string sourceFile = CommonUtilities.sourcePath + fileName;
//Set password, as document is password protected
string password = "somepassword";
int pageNumber = 4;
int newPageNumber = 2;

MoveOptions pageOptions = new MoveOptions(FileFormat.Vsdx, password, pageNumber, newPageNumber);
Stream openSourceFile = new FileStream(sourceFile, FileMode.Open);

DocumentResult result = new DocumentHandler().MovePage(openSourceFile, pageOptions);

//output file
var fileStream = File.Create(CommonUtilities.outputPath + "OutPut." + FileFormat.Vsdx);
Stream documentStream = result.Stream;
documentStream.CopyTo(fileStream);
documentStream.Close();