DropDownList 链接。

  protected void ddlType_SelectedIndexChanged(object sender, EventArgs e)
    {
        int id = Convert.ToInt32(ddlType.SelectedValue);
        string sql = string.Format("select Http from T_YouQingLianJie where id={0}", id);
        string mark = DBHelper.GetScalarString(sql);
        Page.ClientScript.RegisterStartupScript(this.GetType(), "", "<script language=javascript>window.open('" + mark + "')</script>");
    }