Copy Document from One Site Collection to other in SharePoint 2010

The following code copies the document to the library of Destination Site Collection from the library of source Site Collection. The document from source is first compared with the document names of the destination & if the document does not match then only the documents are added to the Library of the Destination Site.

/// CopyToDocLib is a method to Copy Document from Source Library to Destination Library of Source SiteURl to Destination Site URL

/// <param name="sourcesiteUrl">Pass Site URL of Source SiteCollection</param>

/// <param name="destinationsiteUrl">Pass Site URL of Destination SiteCollection</param>

/// <param name="Source">Pass Source Library Name</param>

/// <param name="Destination">Pass Destination Library Name</param>

public void CopyToDocLib(string sourcesiteUrl, string destinationsiteUrl, string Source, string Destination)

{

  SPQuery qry = new SPQuery();

  string camlquery = string.Empty;

           

  SPListItemCollection Srccollitem;

  string filename = string.Empty;

  try

  {

    using (SPSite rootSite = new SPSite(sourcesiteUrl))   //Get Source Site

    {

      using (SPWeb spWeb = rootSite.OpenWeb())    //Open Source Site

      {

       

        //Query to get items according to descending order

        camlquery = "<OrderBy><FieldRef Name='Modified' Ascending='False' /></OrderBy>";

        qry.Query = camlquery;

       

        ///Get the Collection of SourceLibraryDocument by Caml Query

        Srccollitem = spWeb.Lists[Source].GetItems(qry);

                      

        string count = Srccollitem.Count.ToString();    //Get count of items

        using (SPSite destSite = new SPSite(destinationsiteUrl))  //Get Destination Site

          {

            using (SPWeb spWebdest = destSite.OpenWeb())    //Open Destination Site

            {

              string destlibUrl = string.Empty;

              //Get the Destination Library

              SPFolder destlib = spWebdest.Folders[Destination];

             //Get the Absolute URL of the Destination Library

              destlibUrl = destinationsiteUrl + "/" + destlib;

              ///Start of ForEach Loop to Copy Document one by one from Library of Source Site to Library of Destination Site.

             foreach (SPListItem sourceitem in Srccollitem)

             {

               SPQuery chkquery = new SPQuery();

               //Query to get items of destination library according to descending order

               chkquery.Query = "<OrderBy><FieldRef Name='Modified' Ascending='False' /></OrderBy>";

               SPListItemCollection destinationlib = spWebdest.Lists[Destination].GetItems(chkquery);

               string destcount = destinationlib.Count.ToString();

               int cnt=0;

               string destlistitemname=string.Empty;

               //Get Document Name

               string sourcelistitemname = sourceitem.File.Name;

               //Start the ForEach Loop on Destination Library items to check the document already exists

               foreach (SPListItem destitem in destinationlib)

               {

               //Get Destination Document Name

                 destlistitemname = destitem.File.Name;

               //Compare the Source Document Name with all the Destination Document  names one by one

                 if (destlistitemname == sourcelistitemname)

                 {

                    cnt++;

                   //If Document Name already exists, go to next item

                    break;

                 }

               }

               //If document with the same name does not exists then copy the document from source site library to destination site library

               if (cnt == 0)

               {

                 spWebdest.AllowUnsafeUpdates = true;

               //Add document to destination library

                 destlib.Files.Add(sourceitem.File.Name, sourceitem.File.OpenBinary(), true);

                 destlib.Update();

                

                                       

               }

               else

               {

                 Console.WriteLine("The list item " + destlistitemname + " already exists in the library " + Destination + " in Site " + destSite);

               }

             }

          }

        }

        ///End of ForEach Loop

      }

    }

  }

  catch (Exception ex)

  {

 

  }

}