Objective

In this article, I am going to explain, how to insert multi user or more than one user in Share point list.

About SharePoint list where value would be inserted

1. There is a list called TestingUser.
2. There is one column in list called UserTest.
3. This column is of type Person or Group.
4. Allow multiple selections are true.
5. Allow selection is set to People and Group.

TestingUser list looks like below, 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Microsoft.SharePoint;  

namespace TestingMultipleUsre
{
    public partial class _Default : System.Web.UI.Page
    {
        SPWeb _web;
        SPSite _site;
       SPList myList
        protected void Page_Load(object sender, EventArgs e)
        {
            string usercontrolvalue = "dhananjay,arun,anoj,patra,mub";
             _site = new SPSite("http://adfsaccount:2222/");
             _web = _site.OpenWeb();
             myList = _web.Lists["TestingUser"];
             _web.AllowUnsafeUpdates = true ;
             myList = _web.Lists["TestingUser"];
            SPListItem item = myList.Items.Add();
            SPFieldUserValueCollection usercollection = new SPFieldUserValueCollection();
            string[] userarray = usercontrolvalue.Split(',');
            for (int i = 0; i < userarray.Length; i++)
            {
                SPFieldUserValue usertoadd = ConvertLoginName(userarray[i]);
                usercollection.Add(usertoadd);
            }
            item["UserTest"] = usercollection;
            item.Update();
        }
        public  SPFieldUserValue ConvertLoginName(string userid)
        {
            SPUser requireduser = _web.EnsureUser(userid);
            SPFieldUserValue uservalue = new SPFieldUserValue(_web, requireduser.ID, requireduser.LoginName);
            return uservalue;
        }
    }
}

Note: Make sure all the users; you are adding are user of the Sharepoint.

Output

While running output would be as below



Conclusion

In this article, I have explained how to insert more than one user in SharePoint list. Thanks for reading.