View the versions of document from share point document library using code.

Question

HI
i want to develop a web application (asp.net) from
1) users will browse and view documents saved in document library by passing a documents DocumentID as parameter 
to  sharepoint 2010 web application.
2)also that  document has versions and how users  will view required versions, if user  will upload document to document library
it will create new version and if user will same document with same name it over-right as new version.
and how user will view the old version 
adil

Answer 1

Replay:
From your description, my understanding is that you want to develop a web application to view document history versions of SharePoint 2010.
You could accomplish your requirement by using Client Object Model, please refer to this article:
https://msdn.microsoft.com/en-us/library/office/ee857094(v=office.14).aspx.
You could refer to this code below:
namespace clientOM
class Program
static void Main(string[] args)
ClientContext clientContext = new ClientContext("siteUrl");
Web site = clientContext.Web;
clientContext.Load(site);
List list = site.Lists.GetByTitle("Documents");
clientContext.Load(list);
clientContext.ExecuteQuery();
CamlQuery query = new CamlQuery();
query.ViewXml = "<View/>";
ListItemCollection allContacts = list.GetItems(query);
clientContext.Load(allContacts);
clientContext.ExecuteQuery();
FileCollection allFile = list.RootFolder.Files;
clientContext.Load(allFile);
clientContext.ExecuteQuery();
foreach (File file in allFile)
string version = file.UIVersionLabel;
FileVersionCollection versions = file.Versions;
clientContext.Load(versions);
clientContext.ExecuteQuery();
foreach (FileVersion hisVersion in versions)
string hisversion = hisVersion.VersionLabel;
Best Regards
Vincent Han
TechNet Community Support