Method for sorting a list in C#

I've written the the selection sort method beneath. I would like to retain the code in general as it's a school exercise, but I understand that there are more correct ways to do it, as with Linq.
It works well besides that it only sorts the property PersonalNumber. I can see where the error is the following:

temp = list[i].PersonalNumber;
list[i].PersonalNumber = list[posMin].PersonalNumber;
list[posMin].PersonalNumber = temp;

Is there any way to sort all of the properties contained for each index in the list? Or do I have to write the above code for each property? There are three properties in total.

Full method:

public static void SelectionSort(List list) {
    // With this method the Person list is sorted in ascending order. 
    //posMin is short for position of min
    int posMin, temp;
    for (int i = 0; i < list.Count - 1; i++) {
        posMin = i;//Set posMin to the current index of array
        for (int j = i + 1; j < list.Count; j++) {
            if (list[j].PersonalNumber < list[posMin].PersonalNumber) {

                //posMin will keep track of the index that min is in, this is needed when a swap happens
                posMin = j;
            }
        }

        //if pos_min no longer equals i than a smaller value must have been found, so a swap must occur
        if (posMin != i) {
            temp = list[i].PersonalNumber;
            list[i].PersonalNumber = list[posMin].PersonalNumber;
            list[posMin].PersonalNumber = temp;

        }
    }
}

Answer

If you want to sort list in place, just put Sort:

list.Sort((x, y) => x.PersonalNumber.CompareTo(y.PersonalNumber));

To sort in descending order, add -:

list.Sort((x, y) => -x.PersonalNumber.CompareTo(y.PersonalNumber));