[c#] find index of an int in a list

List<string> accountList = new List<string> {"123872", "987653" , "7625019", "028401"};

int i = accountList.FindIndex(x => x.StartsWith("762"));
//This will give you index of 7625019 in list that is 2. value of i will become 2.
//delegate(string ac)
//{
//    return ac.StartsWith(a.AccountNumber);
//}
//);

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