FileInfo[] files = Directory.GetFiles(sourceDir);

foreach (FileInfo file in files)
{
    try
    {
        string path = file.FullName;
        string fileName = file.Name;

        SPDocumentLibrary documentLib = web.Lists.TryGetList("ListName") as SPDocumentLibrary;
        Stream fStream = File.OpenRead(path);
        byte[] _byteArray = new byte[fStream.Length];
        fStream.Read(_byteArray, 0, (int)fStream.Length);
        fStream.Close();

        string _fileUrl = documentLib.RootFolder.Url + "/" + fileName;
        bool IsOverwriteFile = false;
        SPFile file = documentLib.RootFolder.Files.Add(_fileUrl, _byteArray, IsOverwriteFile);
        SPListItem item = file.Item;
        item["Title"] = dr["FileName"].ToString();
        item.Update();
        file.Update();
    }
    catch(Exception ex)
    {
        //Log
    }
}