Question

I’v got a combobox that I created as a user control(it’s actually made up of a label, combobox and textbox). I’m trying to bind a dataset to the combobox datasource, but I keep getting an error message on ValueMember/Display member:

Cannot bind to the new display member - newdisplay member
Cannot bind to the new value member - parameter name: value

I thought I had everything coded correctly for the usercontrol:

   public partial class ucComboBox : UserControl
{
    #region Properties (6) 
    private bool isEditableReadOnly;
    private bool ArrVisible;
    private string _value;
    private string _name;

    public string value
    {
        get { return _value ; }
        set { _value = value; }
    }
    public string name
    {
        get { return _name; }
        set { _name = value; }
    }
}

I have a few other properties and events in the usercontrol but they shouldnt be the issue.

My code to bind the info:

  ((ucComboBox)ctrl).combobox.DataSource = info;
  ((ucComboBox)ctrl).combobox.ValueMember = "radiology_id";
  ((ucComboBox)ctrl).combobox.DisplayMember = "radiology_name";

It blows up whenever it hits value member, and i get the two errors stated above. Am I missing something in my user control? Seems to me this should be working.. (fyi – the info datasource does contain the two columns)

I’ve tried a bunch of different tactics with no success. Please help!

Thanks

Answer 1

Moved away from using a Datatset. Created a class(“Facilities”) that will hold an ID and Name values. Changed “info” to a List type. Then the following code worked just fine:

info.Add(new Facilities { ID = dr["other_facility_id"].ToString(), Name = dr["other_facility_name"].ToString() });

  ((ucComboBox)ctrl).combobox.DataSource = new BindingSource(info, null);//info;
  ((ucComboBox)ctrl).combobox.ValueMember = "ID";
  ((ucComboBox)ctrl).combobox.DisplayMember = "Name";

No issues with binding that.