Concatenation problem in c#

Hi ,
following command
c1 = d.Key.ToString() + '=' + d.Value.ToString();
here value of c1 returns as
type=normal
i want to add single quote on both side of d.value.Tostring();
means c1 should be
type='normal' .
ie add single quote on  ' + d.Value.ToString();
how it is possible

Regards
Baiju