I am working on combo box, i am refresh the combo box values , first i am deleting all values and then re populating it. But it is not working. The code duplicates the values in combo box which is creating problem. Here is my Code. 

```
    for (int i = 0; i < updateCombo.Items.Count; i++)
    updateCombo.Items.RemoveAt(i);

    //----------- Now Adding New Values --------
    updateCombo.Items.Add("Select an option . . .");

    SqlCommand command = new SqlCommand(Queries.qry9, connection);
    SqlDataReader reader = command.ExecuteReader();

```

Kindly please help me in fixing this problem.