.NET----- 对下拉框的控制

<td width="20%" align="right" bgcolor="#F5F5F5">学生性别(<font color="red">*</font>)：</td>
<td align="left" bgcolor="#FFFFFF" width="30%">
<asp:DropDownList ID="tbStuSex" runat="server" width="121px">
    <asp:ListItem></asp:ListItem>
    <asp:ListItem Text="男" Value="男"></asp:ListItem>
    <asp:ListItem Text="女" Value="女"></asp:ListItem>
</asp:DropDownList>
</td>

            this.tbStuSex.Text = gbaoming_jiankang.StuSex.ToString();//性别

            //this.tbStuSex.ReadOnly = true;
            //   this.tbStuSex.Attributes.Add("style", "color:#888888;");//性别

            this.tbStuSex.Enabled = false;
            this.tbStuSex.Attributes.Add("style", "color:#888888;");//性别

       //gbaoming_jiankang.StuSex = this.tbStuSex.Text.Trim();//性别

        gbaoming_jiankang.StuSex = this.tbStuSex.SelectedValue.Trim();//性别
        if (gbaoming_jiankang.StuSex == string.Empty)
        {
            WebMessageBox1.MessageBox_tishi(700, 300, 200, 300, "请选择学生性别");
            return;
        }