How to use POST method with Asp.Net Master page? - asp.net

Question

I have a master page and on the other asp.net form I need to call a method to .ashx file something as shown below:
As I am having problem with the buttons as whatever the button I click its Posting back the content which I don't want to.
<form id="Form1" action="Upload.ashx" method="POST" enctype="multipart/form-data"
runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<div id="fileupload" style="border: thin solid #666666; width: 600px; height: 520px;
z-index: 1; left: 18px; top: 22px; position: absolute; overflow: auto;">
<div class="fileupload-buttonbar">
<label class="fileinput-button">
<span>Add files...</span>
<input type="file" name="files[]" multiple="multiple" />
</label>
<button type="submit" class="start">
Start upload</button>
<button type="reset" class="cancel">
Cancel upload</button>
<button type="button" class="delete">
Delete all files</button>
<div class="fileupload-progressbar">
</div>
</div>
<div class="fileupload-content" style="border-style: none">
<table class="files">
</table>
</div>
</div>
</form>
which is not possible as I have a content page.
So how do I do that within the content of the asp.net form which is based on the masterpage.

Answer 1

You cannot have server side form tag posting to a different page. Server side form control is designed to post-back to self (it ignores the action attribute) - that's why you see your page getting posted to (content) page. Master page is not really a page but rather a template/layout - content page denotes the actual page (master page is really a control whose control tree get merged into the content page tree).
You can also have cross-page posting in ASP.NET using server side button controls.
However, I believe for whatever you are trying to achieve, you need creating a separate html form tag. For example,
...
<!-- server side form - do not touch -->
<form id="Form1" runat="server">
...
</form>
...
<!-- you can have multiple html form tags but you cannot use server controls -->
<form action="Upload.ashx" method="POST" enctype="multipart/form-data">
...
</form>
...