public void remhyp()
{
Uri z = new Uri("http://broken-link/");
WorksheetPart wsPart =
(WorksheetPart)(wbPart.GetPartById(sheet.Id));
var hyperLinks = wsPart.Worksheet.Descendants <Hyperlinks>().First();
var hyperRel = wsPart.HyperlinkRelationships.Where(c => c.Uri == z).FirstOrDefault();
foreach (Hyperlink item in hyperLinks)
{
if (hyperRel.Id == item.Id)
{
wsPart.DeleteReferenceRelationship(item.Id.ToString());
item.Remove();
}
if (hyperLinks.Count() == 0)
{
hyperLinks.Remove();
}
}
wsPart.Worksheet.Save();
}