How to find and replace double quotes?

Question

Hi All,
Here's my dilemma.  I am trying to create a data cleansing app that looks at a single column in a Sybase db and replaces double quotes " with a space. 
Here is my current code (which obviously isn't working).
Any ideas?
Many thanks.
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string strSql = string.Empty;
string find = """;
string replace = " ";
strSql = "DECLARE @patfind varchar(255)"
+ "UPDATE my_table SET my_column = ltrim(rtrim(STUFF( my_column,PATINDEX( '"+find+"', my_column),"
+ "DATALENGTH( '" + find + "' ),'" + replace + "' ))) WHERE email LIKE '" + find + "' ";