How to show an ArrayList in a RichTextBox

Technically, string builder is doing the same thing as the copyto method. Remember, Strings are "immutable". When a string is created, it has a fixed length--think of it as a constant. To add or remove characters leads to the creation of a new string in memory--the one string cannot be manipulated by itself. To alleviate this, .NET has certain methods that we, as developers, have been trained to use (i.e. string.Concat, string.Format, and StringBuilder). This is the same method any VBA developer had to learn when dealing with strings--build a collection then put the string together into one string. I can only assume that the framework is optimized to build a collection of strings for best performance. Again, guys, the WROX press C# Class Design book is your Bible for understanding .NET development in its rudiments. -- Shoe

StringBuilder is typically much faster than string manipulation, but since you're allocating the exact number of character for the string, your option might be faster. It'd be interesting to see a test between the two.

Another option, I don't know which is faster... string[] s = new string[arrayList1.Count-1]; arrayList1.CopyTo(s); string output = string.Join(";", s);