Hi,
you can easily achive this
1)Open edmx file.
2)Click on Employe table
3)Right click on EmployeeFist. Click cut.
4)Click on EmployeID.Right click and paste.
5)This will place EmployeeFist after employeid.
6)Now right click on table and click table mappings.
7)you will find employefirst on left. and blank onright. select employefirst from dropdown on right.
Once you did this this will be play for you for 3 secods,
Mark this as answer if it helps you.