@DefaultValue = '''' + @DefaultValue + ''''
That doesn't help with a parameter. That is why you have to parse it. Read through the responses in this thread.
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Read the article at http://www.sqlservercentral.com/articles/Best+Practices/61537/
for best practices on asking questions.
Need to split a string? Try Jeff Moden's splitter
.Cross Tabs and Pivots, Part 1 – Converting Rows to Columns Cross Tabs and Pivots, Part 2 - Dynamic Cross Tabs Understanding and Using APPLY (Part 1)Understanding and Using APPLY (Part 2)