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this.cbHangye.DropDownStyle = ComboBoxStyle.DropDownList;
// 必须指定下拉框的DisplayMember与ValueMember属性
this.cbHangye.DisplayMember = "Name";
this.cbHangye.ValueMember = "Value";
ComBoxItem item = new ComBoxItem();
item.Name = "设备制造";
item.Value = "1";
this.cbHangye.Items.Add(item);
item = new ComBoxItem();
item.Name = "电子商务";
item.Value = "2";
this.cbHangye.Items.Add(item);
item = new ComBoxItem();
item.Name = "白色家电";
item.Value = "3";
this.cbHangye.Items.Add(item);
item = new ComBoxItem();
item.Name = "食品卫生";
item.Value = "4";
this.cbHangye.Items.Add(item);
item = new ComBoxItem();
item.Name = "金融";
item.Value = "5";
this.cbHangye.Items.Add(item);