problem with the apostrophe in a text box

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C#

here is the code

if (char.IsLetter(e.KeyChar) || e.KeyChar == 8 || e.KeyChar == '$' || e.KeyChar == '-' || e.KeyChar == ' ' || e.KeyChar == ' ' ')
           {
               e.Handled = false;
           }
           else
           {
               e.Handled = true;
           }

i want that name textbox should also accept the apostrophe,how can i do that? if i add e.keychar==' ' ' i get an error