2
You can try iTextSharp, which is a free library
2 You can achieve through Spire.PDF dlls which are easily available through NuGet package.
PM> Install-Package Spire.PDF
For more information, check the following step-by-step link in C# and VB
https://www.e-iceblue.com/Tutorials/NET/Spire.PDF/Program-Guide/Table/C-/VB.NET-Extract-Tables-from-PDF.html