This article contains information for .NET development using the evaluation version of VintaSoft Twain .NET SDK.
If you need information about web development (JavaScript, ASP.NET Core, ASP.NET MVC, ASP.NET WebForrms, PHP, React.js, Angular, Vue.js, etc) using the evaluation version of VintaSoft Twain .NET SDK, please read this article.

General information about evaluation version of VintaSoft Twain .NET SDK

The evaluation version of VintaSoft Twain .NET SDK allows you to test the SDK functionality and so check if it suits your requrements.

The evaluation version allows to develop .NET applications for test purposes only.

The evaluation version does NOT allow to use the developed test applications in production or for commercial purposes.

The evaluation version works during 30 days of evaluation period. For activating the evaluation period you should request the evaluation license.

The evaluation version has several minor limitations of use listed below.

It's prohibited to rent, lease, sell, modify, decompile, disassemble, crack, otherwise reverse engineer the evaluation version.

If you installed the evaluation version of VintaSoft TWAIN .NET SDK to your Windows computer, you can request the evaluation license file ("C:\Users\%USERNAME%\AppData\Local\VintaSoft\Twain .NET\VSTwainNet15_1.Windows.Evaluation.lic") and SDK will automatically get the evaluation license from evaluation license file when your .NET desktop application is executed on your computer.

If you did not installed the evaluation version of VintaSoft TWAIN .NET SDK to your Windows computer (for example, you downloaded VintaSoft DLLs from www.nuget.org), you need to embed the evaluation license into source codes of your .NET application.

If you want to deploy developed .NET application to other computer, you need to embed the evaluation license into source codes of your .NET application.

Request an evaluation license file

If you installed the evaluation version of VintaSoft TWAIN .NET SDK to your Windows computer, the installer will run the Evaluation License Manager (file "<SdkInstallPath>\VintaSoft\Twain .NET 15.1\VSTwainNetEvaluationLicenseManager.exe") at the end of SDK installation process. Also you can run the Evaluation License Manager manually at any time.

If you wan to get the evaluation license file, you need to do the following steps:

1. Run the Evaluation License Manager:
   
2. If you do not have account on VintaSoft User Portal, click the "Create account" link and you will be redirected to the https://myaccount.vintasoft.com web site.
3. Specify email and password for your account on VintaSoft User Portal and click the "Request 30 days evaluation license" button.
4. The evaluation license will be saved to the file "C:\Users\%USERNAME%\AppData\Local\VintaSoft\Twain .NET\VSTwainNet15_1.Windows.Evaluation.lic" if request was successful.

Request C#/VB.NET code to embed the evaluation license into source codes of your .NET application

If you need C#/VB.NET code to embed the evaluation license into source codes of your .NET application, you need to do the following steps:

1. Go to VintaSoft User Portal at https://myaccount.vintasoft.com.
2. Click "Register account now" link if you do not have account in VintaSoft User Portal.
3. Login to VintaSoft User Portal.
4. Select "View Evaluation Licenses" tab.
5. Click "Request license for Windows/Linux development" button in "Request evaluation license for VintaSoft TWAIN .NET SDK" section if you do not requested the evaluation license earlier.
6. Click "Get C#/VB.NET code for SDK registration" button at the right side of information about evaluation license => Text with C#/VB.NET code for SDK registration will be added to the clipboard.
7. Add C#/VB.NET code from clipboard at the start of your .NET code.

Limitations of evaluation version

Evaluation version has the following limitations:

• Evaluation version adds watermarks to the scanned images.
• Evaluation version does not allow to save color images to JPEG, TIFF or PDF file.
  Save color image to PNG or BMP file if you want to evaluate saving of color images.
  Scan black-white or grayscale image if you want to evaluate saving of image to JPEG, TIFF or PDF file.