Removing line breaks using C#

I am getting a string from database field named 'Description' and it has line breaks. It looks like this:

Header of Items

Description goes here.This the description of items.

How can I remove the line breaks. I tried following function but It is not working:

public string FormatComments(string comments)
{
    string result = comments.Replace(@"\r\n\", "");
    result = result.Replace(" ", "");
    return result;
}

Please suggest solution.

Regards, Asif Hameed