How to check if an item exists in a string List and if it exists, get its index

To get the index we can use int index = myList.FindIndex(a => a.StartsWith("string_to_search")); when we are sure the string exists in myList.

But how to check if it is present in the List and get its index if it is present? For the time being, I am using the following code.

int ii=0;
foreach (var item in myList){
    if (item == "string_to_search")
        Console.WriteLine("Found at index: " + ii);
    // index is ii
    ii++;
}

Is there any better way to do this ?