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Asp.net refresh DropDownList

Posted on 2010-09-02
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Last Modified: 2012-05-10
I have an Asp.net page with several DropDownLists.
When the user selects an item from the list, it redirects him to another page.
If the user clicks the browser's back button, the item is still selected in the DropDownList.
How do I make it so that when he goes back to that page, the DropDownList is reset?
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Question by:Rick
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5 Comments
 
LVL 7

Expert Comment

by:urir10
ID: 33591617
try to add that to your aspx page that has the drop down on it:

<meta http-equiv="expires" content="-1">
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LVL 13

Author Comment

by:Rick
ID: 33596355

Where?

 


<%@ Page Title="" Language="VB" MasterPageFile="~/MasterPage2.master" AutoEventWireup="false" CodeFile="MainPage.aspx.vb" Inherits="_Default" %> 
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder2" Runat="Server"> 

<table align="center" cellspacing="10" class="style33"> 
<tr> 
<td class="style35"> 
<asp:Image ID="imgCreation" runat="server" ImageAlign="AbsMiddle" 
ImageUrl="~/img/Icons/address-book-2.png" ToolTip="Creation" /> 
&nbsp; Creation</td> 
<td class="style37"> 
<asp:Image ID="imgMaintenance" runat="server" ImageAlign="AbsMiddle" 
ImageUrl="~/img/Icons/under-construction.png" ToolTip="Maintenance" /> 
&nbsp; Maintenance</td> 
</tr> 
<tr> 
<td class="style34"> 
<asp:DropDownList ID="drpCreation" runat="server" AutoPostBack="True" 
Width="450px"> 
</asp:DropDownList> 
</td> 
<td> 
<asp:DropDownList ID="drpMaintenance" runat="server" Width="450px"> 
</asp:DropDownList> 
</td> 
</tr> 
</table> 
<br /> 
<table align="center" cellspacing="10" class="style33"> 
<tr> 
<td class="style35"> 
<asp:Image ID="imgFunding" runat="server" ImageAlign="AbsMiddle" 
ImageUrl="~/img/Icons/calc.png" ToolTip="Funding" /> 
&nbsp; Funding</td> 
<td class="style37"> 
<asp:Image ID="mgDistribution" runat="server" ImageAlign="AbsMiddle" 
ImageUrl="~/img/Icons/anchor.png" ToolTip="Distribution" /> 
&nbsp; Distribution</td> 
</tr> 
<tr> 
<td class="style34"> 
<asp:DropDownList ID="drpFunding" runat="server" Width="450px"> 
</asp:DropDownList> 
</td> 
<td> 
<asp:DropDownList ID="drpDistribution" runat="server" Width="450px"> 
</asp:DropDownList> 
</td> 
</tr> 
</table> 
<br /> 
<br /> 
<table align="center" cellspacing="10" class="style33"> 
<tr> 
<td class="style35"> 
<asp:Image ID="imgInventory" runat="server" ImageAlign="AbsMiddle" 
ImageUrl="~/img/Icons/adress-book.png" ToolTip="Inventory" /> 
&nbsp; Inventory</td> 
<td class="style37"> 
<asp:Image ID="imgReports" runat="server" ImageAlign="AbsMiddle" 
ImageUrl="~/img/Icons/folder-open.png" ToolTip="Reports" /> 
&nbsp; Reports</td> 
</tr> 
<tr> 
<td class="style34"> 
<asp:DropDownList ID="drpInventory" runat="server" Width="450px"> 
</asp:DropDownList> 
</td> 
<td> 
<asp:DropDownList ID="drpReports" runat="server" Width="450px"> 
</asp:DropDownList> 
</td> 
</tr> 
</table> 
<br /> 
<br /> 
<table align="center" cellspacing="10" class="style33"> 
<tr> 
<td class="style35"> 
<asp:Image ID="imgUtilities" runat="server" ImageAlign="AbsMiddle" 
ImageUrl="~/img/Icons/magnet.png" ToolTip="Utilities" /> 
&nbsp; Utilities</td> 
<td class="style37"> 
<asp:Image ID="imgEuJpReports" runat="server" ImageAlign="AbsMiddle" 
ImageUrl="~/img/Icons/folder-open.png" ToolTip="Eu and JP Reports" /> 
&nbsp; Eu and JP Reports</td> 
</tr> 
<tr> 
<td class="style34"> 
<asp:DropDownList ID="drpUtilities" runat="server" Width="450px"> 
</asp:DropDownList> 
</td> 
<td> 
<asp:DropDownList ID="drpEuJpReports" runat="server" Width="450px"> 
</asp:DropDownList> 
</td> 
</tr> 
</table> 
</asp:Content> 
<asp:Content ID="Content3" runat="server" contentplaceholderid="head"> 

<style type="text/css"> 
a {font-family:Arial;} 
a:link {text-decoration: none; color:blue;} 
a:visited {text-decoration: none; color:blue;} 
a:hover {text-decoration: none; color:black} 
a:active {color:black;text-decoration: none} 
.style5 
{ 
margin-left: 24px; 
font-weight: normal; 
} 
.style33 
{ 
width: 910px; 
} 
.style34 
{ 
width: 416px; 
} 
.style35 
{ 
width: 416px; 
font-weight: bold; 
font-family: Arial, Helvetica, sans-serif; 
color: #FFFFFF; 
font-size: large; 
text-align: left; 
background-color: #336699; 
} 
.style37 
{ 
font-family: Arial, Helvetica, sans-serif; 
font-weight: bold; 
color: #FFFFFF; 
font-size: large; 
text-align: left; 
background-color: #336699; 
} 
</style> 
</asp:Content> 
  

  
  
  
  
  

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LVL 7

Expert Comment

by:urir10
ID: 33596369
just under the <%@ Page  tag and before the <asp:Content  tag
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LVL 13

Accepted Solution

by:
Rick earned 0 total points
ID: 33596928
I tried that, but it gives me a "Content is not supported outside 'script' or 'asp:content' regions.
I also tried putting it here:

<asp:Content ID="Content3" runat="server" contentplaceholderid="head">

<meta http-equiv="expires" content="-1" />

<style type="text/css">
a {font-family:Arial;}
.....
 
... but it didn't work. No error messages. But it didn't work at run time.
 
Thanks,
Rick
0
 
LVL 13

Author Closing Comment

by:Rick
ID: 33621657
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