using System;
using System.Linq;
public class Test
{
public static void Main()
{
string[] arrayEnglishMonth = { "JANUARY", "FEBRUARY", "MARCH", "APRIL", "MAY", "JUNE", "JULY", "AUGUST", "SEPTEMBER", "OCTOBER", "NOVEMBER", "DECEMBER" };
var item = arrayEnglishMonth.First(c => c.StartsWith("AUG"));
var index = Array.IndexOf(arrayEnglishMonth, item);
Console.WriteLine(index);
}
}
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