sql report 2005 report formats

The most important thing to know is that in text files, "\r\n" is used to indicate the end of a record. So for plain text, you can use two "\r\n" for a paragraph. If you use a function such as WriteLine, then it will write one set of "\r\n".
 
Hopefully that is all you need to know. I don't know what format that sql server report service 2005 report uses, or that you are using. There are other codes that are used for HTML and other codes for RTF and other codes for Word, so it might be necessary for you to be more specific in order to get a more specific answer.