"Feature classes and tables participating in a network analysis dataset or a topology cannot be deleted."
Is the featureclass not deleted or are you saying it is deleted but it exists elsewhere?
Well if the Delete Tool in Arctoolbox won't allow you to delete it and it doesn't participate in any other thing, then you might want to contact tech support or provide more details on how you are trying to delete it and the data structure and location where it originated
1. Created new Feature class and added to geometric network dataset.
2. Then tried to copy and paste to local FGDB.
3. While copying the newly created Feature class cannot copying from SDE to local FGDB.
Copy, paste is my main activity can you please help on this.