wpf Combobox添加请选择项

Sql:

select FName,FName FName_Text from IR_Foor

Server:

[OperationContract]
public DataSet Select_245() {
SqlParameter[] db = {
new SqlParameter("@type",SqlDbType.VarChar),
};
db[0].Value = “Select_245”;
return DALMethod.QueryDataSet(“SAUD_Class7”,db);
}

C#:

DataTable dataTable = dbs_07.Select_245().Tables[0];
DataRow dataRow = dataTable.NewRow();
dataRow[“FName_Text”] = “–请选择–”;
dataRow[“FName”] = string.Empty;
dataTable.Rows.Add(dataRow);
IDFoorName.ItemsSource = dataTable.DefaultView;
IDFoorName.DisplayMemberPath = “FName_Text”;
IDFoorName.SelectedValuePath = “FName”;
IDFoorName.SelectedValue = string.Empty;

XAML: