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I am working on a console application that updates list items using managed CSOM. I have a user or group column in this list that can contain multiple values. Now, I am using below code to update the value of this column:

// Get the user  
User newUser = web.EnsureUser("LoginName");  
context.Load(newUser);  
context.ExecuteQuery();  
FieldUserValue userValue = new FieldUserValue();  
userValue.LookupId = newUser.Id;

// Update the list item  
listItem["User"] = userValue;

The issue is if I assign the value of user1 to this column, the value that I see after the column is updated is another user; like user2. I don't know why it is populating this code with some other user?

Any idea on this issue?

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You should call Update() and ExecuceQuery() at the end of the code as shown here:

 Microsoft.SharePoint.Client.User _newUser = _ctx.Web.EnsureUser("domain\\username");
 _ctx.Load(_newUser);
 _ctx.ExecuteQuery();

 Microsoft.SharePoint.Client.FieldUserValue _userValue = new Microsoft.SharePoint.Client.FieldUserValue();
 _userValue.LookupId = _newUser.Id;
 _listItem["userfield"] = userValue;
 _listItem.Update();
 _ctx.ExecuteQuery();

I suggest you to use Fiddler to see the network traffic between client and server.

  • Yes, I am doing it. Forgot to add that part in the question. I am updating the list item and then firing ExecuteQuery as well. – Mohan Divraniya Jan 15 '15 at 15:31

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