Date Difference With Weekoff

Question

For my Asp.net C# website, I want to find the difference between two given dates from user, which should exclude second, fourth Saturday of the month and holidays.

 

I had stored Holiday dates in table.

 

I had used to avoid Sunday by using the following code

if (date.DayOfWeek != DayOfWeek.Sunday).

  

For example:

From Date: 30/08/2018

To Date:    03/09/2018 

I want answer like: Total Days - 3 

 

From Date:  07/09/2018

To Date:       10/09/2018

I want answer like: Total Days - 2