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+====== Create zip archive in C# .NET Core 5 ======
+<code csharp>
+using SaveFileDialog sfd = new() { Filter = "Zip archive|*.zip", Title = "Save zip file", AddExtension = true, DefaultExt = ".zip" };
+  sfd.ShowDialog();
+  if (sfd.FileName != "")
+  {
+    using var memoryStream = new MemoryStream();
+    using (var archive = new ZipArchive(memoryStream, ZipArchiveMode.Create, true))
+    {
+      using var entryStreamFileDB = archive.CreateEntry("file.ext").Open();
+      using StreamWriter streamWriterDB = new(entryStreamFileDB);
+      streamWriterDB.Write("some text");
+      streamWriterDB.Close();
+      archive.CreateEntryFromFile(@"c:\tmp\some_file_on_disk.ext", "file1.ext");
+    }
+    using var fileStream = new FileStream(sfd.FileName, FileMode.Create);
+    memoryStream.Seek(0, SeekOrigin.Begin);
+    memoryStream.CopyTo(fileStream);
+  }
+</code>