How I can connect my data to the chart by combo box

Dear All
as attachment you can find my file which I have problem with it
and my problem is :
I want when choosing new record in my validation data then my chart update .

for my problem I have a solution :
I have a name for my chart that defined by condition formula (if .... then .... ) and want to my chart connected to it (chart source ) but it wouldnt work because I dont know how connect a chart by a combo box or validation data?