Old Version 2015.3.1214.1050 WorkSheet Add HyperLink
worksheet.Cells[i, j].SetFormat(new CellValueFormat(""));
var _value = string.Format("=HYPERLINK(\"http://www.google.co.kr\", \"{0}\")",boundColumn.GetValueForItem(grid.Items[i]));
worksheet.Cells[i, j].SetValue(_value);