Problem to format timestamp C# ..don't want trailing zeros

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C#

parameterlist4 is 2016-10-13T09:27:35.000Z

After parsing I am getting 2016-10-13T09:27:35 then adding 1 second

myDateTimetest = 2016-10-13T09:27:36 (Add Seconds)

Then I am converting it to "o" format it gives me "2016-10-13T09:27:36.0000000Z" string

which format do I have to use to get timestamp in this format "2016-10-13T09:27:36.000Z"?

Thank you.

What I have tried:

DateTime myDateTime = DateTime.Parse(parameterlist4);

var myDateTimetest = myDateTime.ToUniversalTime();


for (int i = 0; i < 90; i++)
{
//string timestampadd = Convert.ToString (myDateTime);

string timestampadd = myDateTimetest.ToString("0");

SnapshotDateTimenew[i] = timestampadd;

myDateTimetest = myDateTimetest.AddSeconds(1);

}