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var res = from a in Member
select new { a.MemberID, a.MemberName };
DropDownList2.DataSource = res;
DropDownList2.Items.Insert(0, new ListItem("--请选择--", "0"));
DropDownList2.DataTextField = "MemberName";
DropDownList2.DataValueField = "MemberID";
DropDownList2.DataBind();
or
DropDownList2.Items.Add(new ListItem("请选择栏目", "0"));
this.DropDownList2.Items.Add(new ListItem(row["MemberName "].ToString(), row["MemberID"].ToString()));