partitioning - Dual boot grub rescue

I deleted a partition. When i restarted my computer i had an interface showing this message: "error no such partition.
Grub rescue>"
I don't know if the partition i've deleted was the one where ubuntu were installed (if so im dead. All my important projects are inside) or it was only storing the grub files.
Note that i have a dual boot.
Who can please help me save both my linux and windows please!