Hi I just new to web , when I try to do something simple like :

- populate the datasource of  Webcombo a list of object

public class vComboObject
        {
           
            private String _colValue;
            private String _colHeader;

            public String colValue
            {
                get { return _colValue; }
                set { _colValue = value; }
            }
            public String colHeader
            {
                get { return _colHeader; }
                set { _colHeader = value; }
            }

      }

void Page_Load(object sender, EventArgs e)
        {

            List <vComboObject> vcombo;

            // some code set data for vcombo here
            MyCombo.Datasource =   vcombo ;    
            MyCombo.DataValueField = "colValue";
            MyCombo.DataTextField = "colHeader";
            MyCombo.DisplayValue = "colHeader";
        }

- The webcombo is display fine but I can't access to its column for example :

+ Can't set header caption by : MyCombo.Columns[0].Header.Caption="My header"; // will throw an error

+ Or set the first column hidden for single column combo: MyCombo.Columns[0].hidden= true;

- At my winform application when populate a wincombo like that I still can do all thing above :

+ Set header : MyCombo.DisplayLayout.Bands[0].Columns[0].Header.Caption ="My header";

+ Hidden column :  MyCombo.DisplayLayout.Bands[0].Columns[0].Hidden=true;

Do I mistake something?

Thanks for read, appreciate any help.