delete record in a file out of a list/combo box??

hi together,
try to find a way to delete a record out of a list / combo box
example:
1 open list / combo box filled by file
2 select item
3 delete record corresponding to this item

1 and 2 ok
3 where to get the recordnumber out of the list / combo box ????

has anybody an idea???

thanks

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