Does Array.ToString() provide a useful output?

Option 1

If you have an array of strings, then you can use String.Join:

string[] values = ...;

string concatenated = string.Join(",", values);

Option 2

If you're dealing with an array of any other type and you're using .NET 3.5 or above, you can use LINQ:

string concatenated = string.Join(",",
                          values.Select(x => x.ToString()).ToArray());

You can certainly do that, but it's not the default behaviour. The easiest way to do that (from .NET 3.5 anyway) is probably:

string joined = string.Join(",", array.Select(x => x.ToString()).ToArray());

MoreLINQ has a built-in method to do this:

string joined = array.ToDelimitedString();

or specify the delimited explicitly:

string joined = array.ToDelimitedString(",");

No, ToString of an array will give you the Type name string of the object. use String.Join method instead.

It doesn't (as you noticed).

For string arrays you can use:

string.Join(",", myArray)

for other arrays I think you need to code it yourself.

To achieve this effect you should call String.Join(string, string[])

I.e.

string[] stringArray = new string[] { "a", "b", "c" };
string.Join(",", stringArray);