How to retrieve data from database to radio button

I saved radiobutton value in database like "A4Size" or "A5Size".Now i want to retrieve that data from database to radiobutton.If A4Size in database i want to check the Radionbutton (A4Size) value other wise uncheck the radiobutton (A5Size) value.

Code Like this

private void BillLoad()

{

DataTable dt = new DataTable();

con.Open();

SqlDataReader myReader = null;

SqlCommand myCommand = new SqlCommand("select * from Bill ", con);

myReader = myCommand.ExecuteReader();

while (myReader.Read())

{

if (myReader["ReportSize"].ToString() == "A4_Size")

{

ChhkA4.Checked = true;

}

else

{

ChhkA5.Checked = true;

}

}

con.Close();

}