how to load values from database junction Tabelle to Wondows Form

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C#

I got a windows form
say Form qualifiation
Here i stores information of different applicant for a job...
With insert i have done and it works well,
For example my Junction 1 Tabell Programming language
Form DESIGN
FIRST combobox for programming language like c,C++...
then i have got 3 Radio Buttons For Basic Medium and Expert
On control leave event i have implemented insert Command for first Junction table,
Say user select C++ and click on Basic Radio Button then
Junction Table
Applicant ID Programming ID level
eg, 1 1(for c++) (1)Basic -- OK
Same way i have wrriten a insert command for rest of 2 ither Tables...Insert works Perfectly fine
Now I want that when i click on Load Button respective Values from 3 Junction tables
shold be loaded..How to do this or anyone gor similar kind of code any suggestions????