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 index = arrayEnglishMonth.Select((v, i) => new { v, i })
.Where(i => i.v.StartsWith("AUG"))
.Select(i => i.i)
.First();
Console.WriteLine(index);
}
}
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