datagridview1.columns[x] bind to another table

See more:

C#

hi I have combobox1 and datagridview1.
combobox1 binds to table groupperson.

when user select item from combobx1 datagridview1 show id of selected item.
now I want datagridview1.columns[10] binds to another table and show name where id = combobox1 selected item id.

for example :

in combobox1 : user select friend where id = 5
when click button datagridview.columns[10] show 5

now I want datagridview1.columns[10] binds to another table and show name where id = 5 instead 5.