The ornamental design for a contactmember, as shown and described.
FIG. 1 is a front elevational view of a contact member showing my new design, a rear elevational view thereof being a mirror image;
FIG. 2 is a right side elevational view thereof;
FIG. 3 is a left side elevational view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof; and,
FIG. 6 is a front, top and right perspective view thereof.
The broken line in the drawing views is included to show unclaimed environment only and forms no part of the claimed design. The dash-dot line represents the boundaries of the claimed design.