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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);
It's even easier if you consider that the Generic List in C# is indexed from 0 like an array. This means you can just use something like:
int index = 0; int i = accounts[index];
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