Hello,

I have tried the following and it does work for me:

ultraComboEditor1.Value = new object[]{"val1", "val2"};

where the "val1" and "val2" are the values from the column that I am assigning as a "ValueMember" .

        public Form1()
        {
            InitializeComponent();
            DataTable dt = new DataTable();
            dt.Columns.Add("String", typeof(string));
            dt.Columns.Add("String1", typeof(string));

            dt.Rows.Add("a", "val1");
            dt.Rows.Add("b", "rr");
            dt.Rows.Add("c", "pp");
            dt.Rows.Add("d", "gg");
            dt.Rows.Add("e", "val2");

            ultraComboEditor1.DataSource = dt;
            ultraComboEditor1.DisplayMember = "String";
            ultraComboEditor1.ValueMember = "String1";

            ultraComboEditor1.CheckedListSettings.CheckBoxStyle = Infragistics.Win.CheckStyle.CheckBox;
            ultraComboEditor1.CheckedListSettings.CheckBoxAlignment = ContentAlignment.MiddleRight;

            ultraComboEditor1.CheckedListSettings.EditorValueSource = Infragistics.Win.EditorWithComboValueSource.CheckedItems;

            ultraComboEditor1.CheckedListSettings.ListSeparator = ", ";

            ultraComboEditor1.CheckedListSettings.ItemCheckArea = Infragistics.Win.ItemCheckArea.CheckBox;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            ultraComboEditor1.Value = new object[]{"val1", "val2"};
        }

Please let me know if you have any further questions.

darylleger said:

Also setting the Value property seems to do nothing. 

The value you assign has to support multiple values, so if you set the Value property to the value of the item you want to check, it won't make that item checked. You can, however, assign a value like 'new object[]{ foo }' where foo is the value of the item you want to check. If you are doing this and the item is not appearing checked, you should report it as a bug.