Place oven rack in lowest position
Preheat oven to 375° F (190° C)
In bowl, mix together sugar, cornstarch, cinnamon, and salt
Place blueberries in separate bowl. Sprinkle above mixture over blueberries.
Place bottom pie crust in pie plate. Crimp and flute the edges.
Scoop blueberry pie filling into crust.
Cut second pie crust into ½-inch wide strips. Weave into a latice over the blueberry pie filling. Crimp the edges.
Place pie on bottom rack and bake until golden brown and bubbling. Approximately 45 minutes.