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Copy a file of Document Library along with its metadata.

The straight forward way to copy a document from document library is to use CopyTo function like:
ListItem.CopyTo(distinationURL+"/"+ListItem.File.Name);
This function will copy the file to distinationURL along with its metadata. But if anyone of the field is a lookup field, then it will not copy any of the meta data. For this purpose you must Copy the file and update its metadata seperately. I have used as following in one of my event handler.

SPFile sourceFile=properties.ListItem.File;
SPFile destFile;
using(Stream stream=soureceFile.OpenBinaryStream())
{
destFile=properties.ListItem.Web.Lists[properties.ListTitle].RootFolder.Files.Add(distinationURL,stream,true);
}

SPListItem destinationListItem=destFile.Item;
//Then start copying the metadata as following
destinationListItem["Title"]=properties.ListItem["Title"];
destinationListItem["abc"]=properties.ListItem["abc"];
//copying lookupfield
string partsOfField=properties.ListItem["lookupField"].ToString().Split(';');
destinationListItem["lookupField"]=new SPFieldLookupValue(int.Parse(partsOfField[0].ToString()), partsOfField[1].ToString());

destinationListItem.Update();


Hope it helps!

Welcome Note

I am trying to share some Sharepoint Object model concepts and examples here. Hope it helps to spread my ideas around.