Vaildating radio buttons.

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C#

Hi all

I have the following code

//status selection
              string option1 = "";
              if (radIn.Checked == true)
              {
                  option1 = radIn.Text;

              }
              else if (radOut.Checked == true)
              {
                  option1 = radOut.Text;

              }

-this code selects whatever option the user checks as status (in/out).. now i want to validate that the user checks out(i.e. must first select radOut) before checking in and vice versa.. Know how i can go about doing that? thanks