fileupload in asp.net

Hi,
here is part of my code I use for uploading files into database:

protected void Page_Load(object sender, EventArgs e)
{
if (Page.IsPostBack)
{
if (txtFile.PostedFile != null && txtFile.PostedFile.ContentLength > 0)
{
string filename = Path.GetFileName(txtFile.PostedFile.FileName);
string extension = Path.GetExtension(filename);
string contentType = txtFile.PostedFile.ContentType;
byte[] document = new byte[txtFile.PostedFile.ContentLength];
int fileId = AddFile(filename, extension, contentType, document);

}
}
}
protected int AddFile(string filename, string extension, string contentType, byte[] document)
{
SqlDatabase sqlDatabase = new SqlDatabase
(ConfigurationManager.ConnectionStrings["dbConnString"].ConnectionString);
string sql = "spFile_Add";
SqlCommand sqlCommand = sqlDatabase.GetStoredProcCommand(sql) as SqlCommand;
Object obj = null;
try
{
sqlDatabase.AddInParameter(sqlCommand, "@Filename", SqlDbType.VarChar, filename);
sqlDatabase.AddInParameter(sqlCommand, "@Extension", SqlDbType.VarChar, extension);
sqlDatabase.AddInParameter(sqlCommand, "@ContentType", SqlDbType.VarChar, contentType);
sqlDatabase.AddInParameter(sqlCommand, "@Document", SqlDbType.VarBinary, document);
obj = sqlDatabase.ExecuteScalar(sqlCommand);
if (obj != null)
return int.Parse(obj.ToString());
else
return 0;
}
catch (Exception err)
{
throw new ApplicationException(err.Message);
}
}

I used Microsoft Enterprise Library

Regards
Robert