Getting Excel Column Header String by Column Number

This code snippet demonstrates to get the excel column header name by providing column number to function.

public string GetExcelColumnHeaderName(int ColumnNumber) {
    //Max Length of Alfa char
    int ColumnBase = 26;
    int DigitMax = 4;
    string AlfaChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    if (ColumnNumber <= 0) ColumnNumber = 1;

    if (ColumnNumber <= ColumnBase) return AlfaChars[ColumnNumber - 1].ToString();

    var CharCointainer = new StringBuilder().Append(' ', DigitMax);
    var Current_Col_No = ColumnNumber;
    var offset = DigitMax;
    while (Current_Col_No > 0) {
        CharCointainer[--offset] = AlfaChars[--Current_Col_No % ColumnBase];
        Current_Col_No /= ColumnBase;
    }
    return CharCointainer.ToString(offset, DigitMax - offset);
}