WML : How to display “&” and “$” ?

I perform a loop to add content from database to a string. Then after the loop is done, I will just Response.Write the string out. All the tags ie “

“,”

” and likes are being added in the process.
I keep hitting this error because of either the “&” or the “$”. No matter how I Replace the string for “&” with “&s;” or “\&”, or the “$” with “&dol;”, it does not work.
Can somebody help me out? Thanks.