How to remove all namespaces from XML with C#?

Question

I am looking for the clean, elegant and smart solution to remove namespacees from all XML elements? How would function to do that look like?

Defined interface:

Answer 1

my answer, string-manipulation-based,
lite-most code,

public static string hilangkanNamespace(string instrXML)
    {
        char chrOpeningTag = '<';
        char chrClosingTag = '>';
        char chrSpasi = ' ';
        int intStartIndex = 0;
        do
        {
            int intIndexKu = instrXML.IndexOf(chrOpeningTag, intStartIndex);
            if (intIndexKu < 0)
                break; //kalau dah ga ketemu keluar
            int intStart = instrXML.IndexOfAny(new char[] { chrSpasi, chrClosingTag }, intIndexKu + 1); //mana yang ketemu duluan
            if (intStart < 0)
                break; //kalau dah ga ketemu keluar
            int intStop = instrXML.IndexOf(chrClosingTag, intStart);
            if (intStop < 0)
                break; //kalau dah ga ketemu keluar
            else
                intStop--; //exclude si closingTag
            int intLengthToStrip = intStop - intStart + 1;
            instrXML = instrXML.Remove(intStart, intLengthToStrip);
            intStartIndex = intStart;
        } while (true);

        return instrXML;
    }