Created Unassigned: get column name from index [9424]

To get the name of a column based on it's index, I added the following function to XlWorksheet. This will return
"A3" for columnindex=1 and rowindex=3 -> the columnindex is 1-based
public static string GetColumnAddress(int columnIndex, int rowIndex)
{
string columnName = string.Empty;
while (columnIndex > 0)
{
int remainder = (columnIndex - 1) % 26;
columnName = Convert.ToChar(65 + remainder) + columnName;
columnIndex = (columnIndex - remainder) / 26;
}
return columnName + rowIndex.ToString();
}