Connection string

Hi

  We had develop ASP.net application with SQL server 2016. Now we upgrade  for SQL server toAlways on High Availability 

we had now 3 server 1) Witness   2) SQL-Cluster-1   3 ) SQL-cluster-2 

in 2016 SQL server we used to have Connection string 

Public ConnStr As String = "server=192.168.2.149;Database=EMPLS;UID=FNG_ADMIN;PWD=XXXXX;Connect Timeout=0; pooling='true'; Max Pool Size=400"

Now i want New connection string Which server i had connect ?