you can try this, hope it will meet your requirement
if(checkBox1.checked == true)
{
string value = "your Value";
}
sqlcommand cmd = new sqlcommand("INSERT INTO yourtable (column-name) VALUE ('"+ value +"'), con);
cmd.executeNonQuery();
i showed u a code snippet using concatenation,but its better idea to pass parameter.
hope this will help you
if any question plz ask.
regards
bunzitop