arrays - .NET stream writer Variable format -

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i'm trying write csv file variable output format.

the code is

fs.writeline(string.format(format,                              data(0),                              data(1),                              data(2),                              data(3),                              data(4),                              data(5)                            )             )

this works, if i'm trying pass same argument 

 data(0),  data(1),  data(2),  data(3),  data(4),  data(5)

in string 

str = "data(3)  , data(2)  , data(1)  , data(0)" fs.writeline(string.format(format, str))

i error

index (zero based) must greater or equal 0 , less size of argument list.

what doing wrong?

this literal string:

str = "data(3)  , data(2)  , data(1)  , data(0)"

what want string array this:

str = {data(3), data(2), data(1), data(0)}

note: have change declaration of str being string being string array from: 

dim str string

to 

dim str string()

however

if have bunch of variables write out csv can more this:

    using sr new streamwriter(filename)         dim sb new stringbuilder         each value in data             sb.append(value & ",")         next         sr.writeline(sb.tostring.trimend(","c))     end using

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