Update multichioce field in SharePoint List using C#

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below is the code snippet on how to update a field in sharepoint list which contains multiple chioce value

using(SPWeb oWebsite = SPContext.Current.Site.AllWebs["Site_Name"])
{
  SPList oList = oWebsite.Lists["listname"];
  SPListItem oListItem = oList.Items[0];

  oListItem["columnname"] = "choice1;#chioce2;#chioce3"
  oListItem.Update();
}