Searching for References Dialog Box
The Searching for References dialog box appears when a requested Find All References, Find Symbol, or Rename action is taking a long time to finish.
During these operations, the compiler searches for matching references in the source files of all the projects in the current solution. When the solution is large, the search can take a long time to finish. The dialog box provides information about which file is being searched, and about how much of the search has been completed.
When the Searching for References dialog box appears, you can wait for the search to finish, or you can cancel it.