how to take the first digit of a line c sharp code example

Example 1: on in get first two digit start with two numbers c#

public static int GetFirstDigitLoop(int number)
{
    while (number >= 10)
    {
        number = (number - (number % 10)) / 10;
    }
    return number;
}

Example 2: on in get first two digit start with two numbers c#

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