public bool CheckItemCanBeCopied(ISiteSetting siteSetting, Folder targetFolder, IItem copyItem, string fileName)
{
SPFolder spFolder = (SPFolder)targetFolder;
// list item does not anything unique like document has unique file name
if (copyItem as SPListItem == null)
{
return(true);
}
SPDocument spDocument = (SPDocument)copyItem;
ISharePointService spService = new SharePointService();
return(spService.CheckFileExistency(siteSetting, spFolder.WebUrl, spFolder.ListName, spFolder.FolderPath, null, fileName));
}