using radio button checkbox to be checked true in datagridview

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C#

Note it is windows application.

Design as follows;

i have one radio button.

two check boxes inside the data grid view in my design page.

Run Mode screen as follows;

One Radio Button

In data grid view as follows;

Checkbox1 Checkbox2.

I want when i click the radio button, checkbox1 and checkbox2 all the rows in the datagridview will be checked true.

for that how can i do?

in the radio button checked change event what code i have to written.