Before VS 2017, it was tough to find out to which block particular code line belongs. Microsoft introduced the Structure Visualizer in Visual Studio 2017 which draws a vertical line for each block of code. If you place the cursor on the vertical line, it displays the block for which that line belongs to.
Open Visual Studio 2017 => Create some Windows Application and some class with some method. Here I have added Employee class with GetSal() method. It displays the vertical lines as shown below.
If you place the cursor on the vertical line in parallel to #region CallDatabase, it shows GetSal() method as tooltip because this belongs to GetSal() method only as shown below.