The ornamental design for a toothbrushcase, as shown and described.
FIG. 1 is a front, right side, top perspective view of a toothbrush case showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is a front, right side, top perspective view of thereof with a cover attached to the lower half of the toothbrush case; and,
FIG. 9 is a front, right side, top perspective view of thereof with two covers applied to the toothbrush case.
The broken lines immediately adjacent to the claimed portions are boundaries, all other broken lines are environmental structures; all the broken lines form no part of the claimed design.