public FrmScoreManage()
{
InitializeComponent();
//断开下拉框事件
this.cboClass.SelectedIndexChanged -= new EventHandler(this.cboClass_SelectedIndexChanged);
//初始化班级列表
this.cboClass.DataSource = objScoreService.GetAllClasses();
//设置下拉框显示内容
this.cboClass.DisplayMember = "ClassName";
this.cboClass.ValueMember = "ClassId";
this.cboClass.SelectedIndex = -1;
//恢复下拉框事件
this.cboClass.SelectedIndexChanged += new EventHandler(this.cboClass_SelectedIndexChanged);
}