绑定事件的演示:
SqlDataAdapter adapter = new SqlDataAdapter(sql, myConnection);
DataSet ds = new DataSet();
adapter.Fill(ds);
this.droplist.DataSource = ds.Tables[0];
this.droplist.DataTextField = "IncName"; //显示的值
this.droplist.DataValueField = "IncID";//后台的值
this.DataBind();//绑定
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