We start with array of string, for example:

var strings = new List< string >()
{
    "qwerqwr",
    "asdfgsafsdf",
    "bsdfgsdf",
    "qweqweqwe",
    "casdcasdf",
    "adfasdfasdf",
    "bsadfgsadfsaf",
    "cdadadf",
    "eafdsf",
    "gasdfasdf"
};

We can see that array is sorted in ASC order from element at index 5 “adfasdfasdf”.
Is there any “fast” possibility to find index of element where array starts to be sorted?