SharePoint Copy large document library by CSOM

class Program
 {
 static void Main(string[] args)

{

 ClientContext clntContext = new ClientContext("https://<<SiteUrl>>");

FileCollection collFile = clntContext.Web.GetFolderByServerRelativeUrl("https://<<DocumentLibraryUrl>>/").Files;


clntContext.Load(collFile);

clntContext.ExecuteQuery();

 foreach (File file in collFile)
{

 file.CopyTo("<<Destiation document library url>>" + file.Name, true);

Console.WriteLine(file.Name + " is copied successfully");

clntContext.Load(file);

clntContext.ExecuteQuery();

}

 Console.ReadLine();

}

}

}

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