private void ValidateWriteAccess( string filename ) {
FileStream fs = null;
try {
// Try to open file for write access
fs = new FileStream( filename,
FileMode.Open,
FileAccess.Write,
FileShare.ReadWrite );
}
catch ( UnauthorizedAccessException ) {
// Access was denied, make sure we throw this
throw;
}
catch ( IOException ) {
// Someone else was using the file. Since we did not get
// the unauthorizedAccessException we have access to the file
}
catch ( Exception ) {
// Unexpected, so just throw for safety sake
throw;
}
finally {
if ( fs != null ) {
fs.Close();
}
}
}
