C# - add multiple users into list field with multi selection option

Question

I have a Sharepoint list called AproverList where ApproverName2 field is "Person or Group" type with multiple selection option

This is the code I'm using, but it allows me to enter only one user into the field ApproverName2. Do you know how to achieve the insertion of multiple users into this multi selection field?

        using (ClientContext clientContext = TokenHelper.GetClientContextWithAccessToken(siteUri.ToString(), accessToken))
        {
            Web web = clientContext.Web;
            try
            {
                List targetList = web.Lists.GetByTitle("ApproverList");

                ListItemCreationInformation itemCreateInfo = new ListItemCreationInformation();
                ListItem newListItem = targetList.AddItem(itemCreateInfo);
                newListItem["ApproverId"] = "1";
                newListItem["Title"] = "GBO";
                newListItem["ApproverName2"] = web.EnsureUser("jsamakm");
                newListItem.Update();

                clientContext.Load(newListItem);
                clientContext.ExecuteQuery();
            }
            catch (Exception ex)
            {
            }
        }

Answer 1

Try to use SPFieldUserValueCollection to set multiple person / group field

 SPFieldUserValueCollection usercollection = new SPFieldUserValueCollection();

This is a similar example

SPFieldUserValueCollection value = new SPFieldUserValueCollection();
value.Add(new SPFieldUserValue(web, user1.ID, user1.Name)));
value.Add(new SPFieldUserValue(web, user2.ID, user2.Name)));

objItem["name"] = value;
objItem.Update();

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