Sharepoint adding an item into a Picture Library

private byte [] StreamFile(string filename)
{
FileStream fs = new FileStream(filename, FileMode.Open,FileAccess.Read);
// Create a byte array of file stream length
byte[] ImageData = new byte[fs.Length];
//Read  block of bytes from stream into the byte array
fs.Read(ImageData,0,System.Convert.ToInt32(fs.Length));
//Close the File Stream
fs.Close();
return ImageData;
}

// then use the following to add the file to the list
list.RootFolder.Files.Add(fileName, StreamFile(fileName));