C# winform combobox 在绑定数据之后插入一项选择项

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/**//// <summary>

 /// 填充comboboxB超医师 geovindu@163.com 涂聚文

 ///2009-02-16

 /// </summary>

 privatevoid setDBPyhNameComboBox()

 {

 

     this.combPhy.DataSource =null;

 

     DBConnectioin dbc =new DBConnectioin();

     SqlConnection conn =new SqlConnection(DBConnectioin.conStr);

     conn.Open();

     //DbHelperSQL.setComboList(combPhy, "select PhyID,PhyName  from Physician", "Physician", "PhyName", "PhyID");

     stringsSQL = "select PhyID,PhyName  from Physician";

     stringsTable = "Physician";

 

 

     DataSet dsCourtesy =new DataSet();

     SqlDataAdapter daCourtesy =new SqlDataAdapter();

     DbHelperSQL.setCommand(dsCourtesy, daCourtesy, sSQL, sTable);

     daCourtesy.Fill(dsCourtesy);

     combPhy.DataSource = dsCourtesy.Tables[0].DefaultView;              

     DataRow dr = dsCourtesy.Tables[0].NewRow();

     combPhy.DisplayMember ="PhyName";

     combPhy.ValueMember ="PhyID";            

     dr["PhyName"] ="全部";  

     dr["PhyID"] = -1;  

     dsCourtesy.Tables[0].Rows.InsertAt(dr, 0);

     //combPhy.Text = "全部";

 

 

 }