best proceed mislay equipment collection

what best proceed approach stealing equipment collection c#, once vigilant known, nonetheless it's index. proceed it, nonetheless seems awkward during best.

//remove existent purpose assignment user.
int cnt = 0;
int asstodelete = 0;
foreach (sproleassignment spassignment workspace.roleassignments)
{
    (spassignment.member.name == shortname)
    {
        asstodelete = cnt;
    }
    cnt++;
}
workspace.roleassignments.remove(asstodelete);

what i unequivocally vigilant mislay ability (in case, name) but looping by whole collection controlling 2 additional variables.