ocr to scan and save to db

You can use Spire.OCR library to achieve this task.

https://www.e-iceblue.com/Introduce/ocr-for-net.html 

using Spire.OCR;
using System.IO;

namespace SpireOCR
{
    class Program
    {
        static void Main(string[] args)
        {
            OcrScanner scanner = new OcrScanner();            
            scanner.Scan("image.png");
            File.WriteAllText("output.txt", scanner.Text.ToString());
        }
    }
}

For more information, you can check this documentation:

https://www.e-iceblue.com/Tutorials/Spire.OCR/Quick-Start-for-.NET-Core/How-to-use-Spire.OCR-for-.NET-in-.NET-Core-Applications.html

You can use azure cognitive services to do so. Please check my article for more detail.

https://www.c-sharpcorner.com/article/image-analysis-in-asp-net-core-5-0-using-azure-cognitive-service/ 

https://docs.microsoft.com/en-us/azure/cognitive-services/computer-vision/quickstarts-sdk/client-library