Populate (Bind) CheckBoxList with comma separated (delimited) values using C# and VB.Net in ASP.Net

i hvae two tables

table 1

create table entities(
    entityid int,
    entityname
)

table 2

create table braodcast(
    broadcastid int identity(1,1),
    eneties int
)

in broadcast table if we insert muliplte checklist id after select like (1,2,3) and if we bind that entites checklist if on page load then how can we bind it

i was trying to bind but how can we split and bind the checklist using foreach loop....