When you are saving the image to a specified directory by using Dynamic Web TWAIN's SaveAs*** method, you may receive the following error message returned by the ErrorString property:
1. The specified directory does not exist.
2. You do not have the write permission to create a file in the specified directory.
1. Please check the path of the uploaded file and make sure the directory does exist.
2. Grant the write permission to the folder which is used to hold the uploaded images.