DataTable _dt = new DataTable();

using (SqlConnection _cs = new SqlConnection("Data Source=COMNAME; Initial Catalog=DATABASE; Integrated Security=True"))
{
    string _query = "SELECT * FROM Doctor";
    SqlCommand _cmd = new SqlCommand(_query, _cs);

    using (SqlDataAdapter _da = new SqlDataAdapter(_cmd))
    {
        _da.Fill(_dt);
    }
}
cbDoctor.DataSource = _dt;
foreach(DataRow _dr in _dt.Rows)
{
    cbDoctor.Items.Add(_dr["name"].ToString());
}

Es gab einen Fehler...

Das Ergebnis istSystem.Data.DataRowView anstelle von Daten aus der Datenbank ..