我有一个下拉列表，我在其中选择值，当我从中选择一个值时，会出现一个表单。在那种形式我有四个下拉列表的货币，所以当我在我的下拉列表中选择 .UK 时，表格中的所有四个下拉列表显示GBP，当我选择< strong> .CA 它在表单中的四个下拉列表中显示CAN。我怎么能这样做？
我的第一个drop-dwon列表，我从中选择填写表单的值：
<asp:DropDownList ID="ddlPortal" runat="server" AutoPostBack="True"
onselectedindexchanged="ddlPortal_SelectedIndexChanged">
<asp:ListItem>TRAVELONG</asp:ListItem>
<asp:ListItem>ONETRAVEL</asp:ListItem>
<asp:ListItem>.UK</asp:ListItem>
<asp:ListItem>.CA-YYZ</asp:ListItem>
<asp:ListItem>.CA-YVR</asp:ListItem>
</asp:DropDownList>
我想要更改的下拉列表：
<asp:ValidationSummary ID="vdm" runat="server" ForeColor="Red" />
<table class="style1">
<tr>
<td class="style13">
<asp:Label ID="lblTid" runat="server" Text="TID"></asp:Label>
</td>
<td class="style5">
<asp:TextBox ID="tbTid" runat="server"></asp:TextBox>
</td>
<td class="style4">
<asp:RequiredFieldValidator ID="rfvTid" runat="server"
ControlToValidate="tbTid" ErrorMessage="Enter Tid" Font-Bold="True"
ForeColor="Red">*</asp:RequiredFieldValidator>
</td>
<td class="style5">
<asp:Label ID="lblUnusedTicketAmount" runat="server"
Text="Unused Ticket Amount"></asp:Label>
</td>
<td class="style11">
<asp:TextBox ID="tbUnusedTicketAmount" runat="server"></asp:TextBox>
</td>
<td>
<asp:RequiredFieldValidator ID="rfvUnusedTicketAmount" runat="server"
ControlToValidate="tbUnusedTicketAmount" ErrorMessage="Enter Amount"
Font-Bold="True" ForeColor="Red">*</asp:RequiredFieldValidator>
</td>
<td>
<asp:DropDownList ID="ddlUnusedAmount" runat="server"
onselectedindexchanged="ddlUnusedAmount_SelectedIndexChanged">
<asp:ListItem>USD</asp:ListItem>
<asp:ListItem>CAD</asp:ListItem>
<asp:ListItem>GBP</asp:ListItem>
</asp:DropDownList>
</td>
</tr>
<tr>
<td class="style14">
<asp:Label ID="lblPNR" runat="server" Text="PNR"></asp:Label>
</td>
<td class="style9">
<asp:TextBox ID="tbPNR" runat="server"></asp:TextBox>
</td>
<td class="style8">
<asp:RequiredFieldValidator ID="rfvPNR" runat="server"
ControlToValidate="tbPNR" ErrorMessage="Enter PNR" Font-Bold="True"
ForeColor="Red">*</asp:RequiredFieldValidator>
</td>
<td class="style9">
<asp:Label ID="lblAirlinePenality" runat="server" Text="Airline Penality"></asp:Label>
</td>
<td class="style12">
<asp:TextBox ID="tbAirlinePenality" runat="server"></asp:TextBox>
</td>
<td class="style10">
<asp:RequiredFieldValidator ID="rfvAirlinePenality" runat="server"
ControlToValidate="tbAirlinePenality" ErrorMessage="Enter Penality"
Font-Bold="True" ForeColor="Red">*</asp:RequiredFieldValidator>
</td>
<td class="style10">
<asp:DropDownList ID="ddlAirlinePenality" runat="server">
<asp:ListItem>USD</asp:ListItem>
<asp:ListItem>CAD</asp:ListItem>
<asp:ListItem>GBP</asp:ListItem>
</asp:DropDownList>
</td>
</tr>
<tr>
<td class="style13">
<asp:Label ID="lblTicketNumber" runat="server" Text="Ticket Number"></asp:Label>
</td>
<td class="style5">
<asp:TextBox ID="tbTicketNumber" runat="server"></asp:TextBox>
</td>
<td class="style4">
<asp:RequiredFieldValidator ID="rfvTicketNumber" runat="server"
ControlToValidate="tbTicketNumber" ErrorMessage="Enter ESAC" Font-Bold="True"
ForeColor="Red">*</asp:RequiredFieldValidator>
</td>
<td class="style5">
<asp:Label ID="lblNetRefundProcess" runat="server" Text="Net Refund Process"></asp:Label>
</td>
<td class="style11">
<asp:TextBox ID="tbNetRefundProcess" runat="server"></asp:TextBox>
</td>
<td>
<asp:RequiredFieldValidator ID="rfvNetRefundProcess" runat="server"
ControlToValidate="tbNetRefundProcess" ErrorMessage="RequiredFieldValidator"
Font-Bold="True" ForeColor="Red">*</asp:RequiredFieldValidator>
</td>
<td>
<asp:DropDownList ID="ddlNetRefundProcess" runat="server">
<asp:ListItem>USD</asp:ListItem>
<asp:ListItem>CAD</asp:ListItem>
<asp:ListItem>GBP</asp:ListItem>
</asp:DropDownList>
</td>
</tr>
<tr>
<td class="style13">
<asp:Label ID="lblESACCode" runat="server" Text="ESAC Code"></asp:Label>
</td>
<td class="style5">
<asp:TextBox ID="tbESACCode" runat="server"></asp:TextBox>
</td>
<td class="style4">
<asp:RequiredFieldValidator ID="rfvESACCode" runat="server"
ControlToValidate="tbESACCode" ErrorMessage="Enter ESAC code" Font-Bold="True"
ForeColor="Red">*</asp:RequiredFieldValidator>
</td>
<td class="style5">
<asp:Label ID="lblRefundableCommision" runat="server"
Text="Refundable Commission"></asp:Label>
</td>
<td class="style11">
<asp:TextBox ID="tbRefundableCommision" runat="server"></asp:TextBox>
</td>
<td>
<asp:RequiredFieldValidator ID="rfvRefundableCommission" runat="server"
ControlToValidate="tbRefundableCommision" ErrorMessage="RequiredFieldValidator"
Font-Bold="True" ForeColor="Red">*</asp:RequiredFieldValidator>
</td>
<td>
<asp:DropDownList ID="ddlRefundableCommission" runat="server">
<asp:ListItem>USD</asp:ListItem>
<asp:ListItem>CAD</asp:ListItem>
<asp:ListItem>GBP</asp:ListItem>
</asp:DropDownList>
</td>
</tr>
<tr>
<td class="style13">
<asp:Label ID="lblWaiverCode" runat="server" Text="Waiver Code"></asp:Label>
</td>
<td class="style5">
<asp:TextBox ID="tbWaiverCode" runat="server"></asp:TextBox>
</td>
<td class="style4">
<asp:RequiredFieldValidator ID="rfvWaiverCode" runat="server"
ControlToValidate="tbWaiverCode" ErrorMessage="Enter Waiver Code"
Font-Bold="True" ForeColor="Red">*</asp:RequiredFieldValidator>
</td>
<td class="style5">
<asp:Label ID="lblCouponRefunded" runat="server" Text="Coupon Refunded"></asp:Label>
</td>
<td class="style11">
<asp:TextBox ID="tbCouponRefund" runat="server"></asp:TextBox>
</td>
<td>
<asp:RequiredFieldValidator ID="rfvCouponRefunded" runat="server"
ControlToValidate="tbCouponRefund" ErrorMessage="Enter Coupon Refund"
Font-Bold="True" ForeColor="Red">*</asp:RequiredFieldValidator>
</td>
<td>
</td>
</tr>
<tr>
<td class="style13">
<asp:Label ID="Label7" runat="server" Text="Remarks"></asp:Label>
</td>
<td class="style5">
<asp:TextBox ID="tbRemarks" runat="server" TextMode="MultiLine"></asp:TextBox>
</td>
<td class="style4">
<asp:RequiredFieldValidator ID="rfvRemarks" runat="server"
ControlToValidate="tbRemarks" ErrorMessage="Enter Remarks" Font-Bold="True"
ForeColor="Red">*</asp:RequiredFieldValidator>
</td>
<td class="style5">
<asp:Label ID="lblRefundType" runat="server" Text="Refund Type"></asp:Label>
</td>
<td class="style11">
<asp:DropDownList ID="ddlRefundType" runat="server">
<asp:ListItem>Full</asp:ListItem>
<asp:ListItem>Partial</asp:ListItem>
</asp:DropDownList>
</td>
<td>
<asp:RequiredFieldValidator ID="rfvRefundType" runat="server"
ControlToValidate="ddlRefundType" ErrorMessage="Select Refund Type"
Font-Bold="True" ForeColor="Red">*</asp:RequiredFieldValidator>
</td>
<td>
</td>
</tr>
<tr>
<td class="style13" colspan="7">
<asp:Button ID="Button1" runat="server" onclick="Button1_Click"
Text="Submit" />
</td>
</tr>
</table>
提前致谢..