Update .Edmx file When i change Db connection string in c#

Question

I am not sure if there is a way to update edmx file automatically when database is changed.

current DbName = TestSolutionDB with 4 tables (Country,State,Address,User)

Change DbName = ProjectDB with 4 tables(User,Project,Status,Activity)

When i replace the Connection string like

data source=.;initial catalog ="TestSolution" To

data source=.;initial catalog ="ProjectDB "

I need to update .edmx file (Country,State,Address,User) TO (User,Project,Status,Activity) Design, and tt.file

These All Items can happened by pragmatically, Can give solution?

Thanks