![](http://images.cnblogs.com/cnblogs_com/tangge/304703/r_r_%e4%b9%a6%e9%a1%b511.gif)
SqlConnection con = new SqlConnection("server=.;uid=sa;database=pubs");
SqlDataAdapter sdr = new SqlDataAdapter("select * from employee",con);
SqlConnection con = new SqlConnection("server=.;uid=sa;database=pubs");
SqlDataAdapter sdr = new SqlDataAdapter("select * from employee",con);
DataSet ds = new DataSet();
sdr.Fill(ds);
DropDownList1.DataSource = ds;
DropDownList1.DataTextField = "emp_id";
DropDownList1.DataBind();
DropDownList1.Items.Add(" ");
DropDownList1.Items[this.DropDownList1.Items.Count - 1].Value = " ";
DropDownList1.SelectedIndex = this.DropDownList1.Items.Count - 1;
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this.ddl_xmjl.Items.Insert(0, new ListItem("", "0")); //单独使用,0代表位置
红色或者蓝色单独使用,都可以