The SqlString is a nonmutable class so it can't have sql parts added to it. Instead this class should be used to generate a new SqlString. The SqlStringBuilder is to SqlString what the StringBuilder is to a String.

This is different from the original version of SqlString because this does not hold the sql string in the form of "column1=@column1" instead it uses an array to build the sql statement such that object[0] = "column1=" object[1] = ref to column1 parameter

What this allows us to do is to delay the generating of the parameter for the sql until the very end - making testing dialect indifferent. Right now all of our test to make sure the correct sql is getting built are specific to MsSql2000Dialect.