private void LoadAssigneeList() {
List<AssigneeModel> lstAll = GetAssignees();
ddlCombinedAssignees.Items.Clear(); //Remove all the items, so we don't load more than once
//Add a new category when it changes
int teamCat = -1;
foreach (var item in lstAll) {
if (item.TeamID != teamCat) {
teamCat = item.TeamID;
var itmCat = new RadComboBoxItem(item.TeamName, item.TeamID.ToString());
itmCat.IsSeparator = true;
ddlCombinedAssignees.Items.Add(itmCat);
}
var itm = new RadComboBoxItem(item.LastFirst, item.UserID);
ddlCombinedAssignees.Items.Add(itm);
}
}
Here is a method I use. The "GetAssignees" routine is a class or model. It has four properties: LastFirst, UserID, TeamName, TeamID.
I want my categories to be the TeamName, and the items to be the Name (with UserID as the value).
GetAssignees talks to the DB and populates a List<> of the Assignees... I then walk through that to populate the RadComboBox.