1. How to install and use Dynamic Web TWAIN for the first time?

Please check out this article:
Step by Step Walk-Through on how to install Dynamic Web TWAIN on the client machines with online demo

There will be no installations from the 2^ndtime.

2. Why can't I find any source in the "Select Source"?

If you don't have any TWAIN driver installed on your machine, you can download and install a Virtual Scanner which is developed by the TWAIN Working Group, temporarily to test the features.
32-bit Sample Source   64-bit Sample Source

If you've already installed a driver and still cannot find any source in "Select Source", please check out the following article to troubleshoot:
Why can't I find my scanner in the source list?

3. Why my scanner doesn't respond to the "Scan" button?

Sometimes, your scanner doesn't work and the message shows something like: Pixel Type: 9468 Resolution: 8.829475125027384e-39. When this happens, please make sure the scanner is properly connected, powered on and working. A good way to resolve this issue is to restart the scanner.

4. How can I get the source code of the online demo?

To get the source code, you can click on "Demo Code Download".



5. Can I avoid the alert "Thank you very much for evaluating Dynamic Web TWAIN."?

Yes, this alert comes with the trial version of Dynamic Web TWAIN. The full version doesn't have this alert.

6. Does the trial version on the online demo have any limitations compared to full version?

The trial version is fully functional. However, the trial license will expire 30 days after you install Dynamic Web TWAIN. For detailed information, please refer to:
What is the difference between the trial version and the full version?

7. Why do I get "Your Dynamic Web TWAIN serial number is invalid"?

Please check out this article:
Why do I get "Your Dynamic Web TWAIN serial number is invalid" on the online demo?

8. Why do I get "An Error occurred while copying file DynamicWebTwainCtrl.dll."?

Please check out this article:
Why do I get "An Error occurred while copying file DynamicWebTwainCtrl.dll"?

9. Why do I get "A Runtime Error has occurred. Do you wish to Debug"?

Please refer to:
Why do I get "A Runtime Error has occurred. Do you wish to Debug"?

10. Where are the images uploaded?

On the online demo, all the images are uploaded to Dynamsoft Server and saved in SQL database. In your app, you can change the lines below (server name/ip and action page) in the code to upload the images to your own server:

var strHTTPServer = "www.dynamsoft.com"; //both server name and ip are ok

var CurrentPathName = unescape(location.pathname); //get current PathName in plain ASCII
var CurrentPath = CurrentPathName.substring(0, CurrentPathName.lastIndexOf( "/") + 1);
var strActionPage = CurrentPath + "SaveToDB.aspx"; //the ActionPage's file path