C# winform combobox 在绑定数据之后插入一项选择项

/**//// <summary>

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

///2009-02-16

/// </summary>

private void 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");

string sSQL = "select PhyID,PhyName from Physician";

string sTable = "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";

}

默认让combobox选择一项

comboBox.SelectIndex = 0