UltraWebGrid: how to use a drop-down list in a column

Question

I use the Infragistics grid, and I have a tough time using the drop-down list as a value selector for one of my columns.

I tried reading the documentation, but the Infragistics documentation is not so good. I also looked at the discussion with no luck.

What am I doing so far:

col.Type = ColumnType.DropDownList;
col.DataType = "System.String";

col.ValueList = myValueList;

where myValueList:

ValueList myValueList = new ValueList();

myValueList.Prompt = "My text prompt";
myValueList.DisplayStyle = ValueListDisplayStyle.DisplayText;

foreach(MyObjectType item in MyObjectTypeCollection)
{
    myValueList.ValueItems.Add(item.ID, item.Text); // Note that the ID is a string (not my design)
}

When I look at the page, I expect to see a dropdown in the cells for this column, but my columns are empty.

Answer 1

I found what is wrong.

The column should indicate updates.

uwgMyGrid.Columns.FromKey("colTest").AllowUpdate = AllowUpdate.Yes;

Answer 2

Here is an example from one of my pages:

UltraWebGrid uwgMyGrid = new UltraWebGrid();
uwgMyGrid.Columns.Add("colTest", "Test Dropdown");
uwgMyGrid.Columns.FromKey("colTest").Type = ColumnType.DropDownList;
uwgMyGrid.Columns.FromKey("colTest").ValueList.ValueListItems.Insert(0, "ONE", "Choice 1");
uwgMyGrid.Columns.FromKey("colTest").ValueList.ValueListItems.Insert(1, "TWO", "Choice 2");

Answer 3

    public void MakeCellValueListDropDownList(UltraWebGrid grid, string columnName, string valueListName, string[] listArray)
    {
        //Set the column to be a dropdownlist
        UltraGridColumn Col = grid.Columns.FromKey(columnName);            
        Col.Type = ColumnType.DropDownList;
        Col.DataType = "System.String";

        try
        {
            ValueList ValList = grid.DisplayLayout.Bands[0].Columns.FromKey(columnName).ValueList;
            ValList.DataSource = listArray;
            foreach (string item in listArray)
            {
                ValList.ValueListItems.Add(item);
            }
            ValList.DataBind();
        }
        catch (ArgumentException)
        {

        }
    }