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Prevent other asp buttons from performing submit action

Nate_LR asked
Last Modified: 2015-01-13
I'm building an upload form.  Along with uploading, the user needs to enter some data and may or may not to work with a cart.   The cart buttons remove a listing from the cart or empty the cart entirely.  However, when I attempt to use these buttons, the page performs the submit action I have indicated, return validateForm()....
<form enctype="multipart/form-data" runat="server" method="post" action="gpsFieldPics.py" name="uploadForm" id="uploadForm" onSubmit="return validateForm()">

<asp:Button ID="btnRemove" runat="server" Text="Remove Track" UseSubmitBehavior="false" OnClick="btnRemove_Click" /><br /> 
<asp:Button ID="btnEmpty" runat="server" Text="Empty Cart" OnClick="btnEmpty_Click"  />

<input id="btnProcess" type="submit" value="Upload and Process" onclick="selectAllTracks()" />

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That is not the complete form by the way.   You may notice I tried to use this... UseSubmitBehavior="false" , but it doesn't work in the way I thought it might.   Here are the code behind functions I'm trying to use....
protected void btnRemove_Click(object sender, EventArgs e) 
        if (trks.Count > 0)
            if (trkCart.SelectedIndex > -1)
                lblMessage.Text = "Please select the item you want to remove.";

 protected void btnEmpty_Click(object sender, EventArgs e)
        if (trks.Count > 0)

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I apparently cannot use PageFunctions or Ajax to call the code-behind functions because they are not static and don't return anything.

I also cannot split the form into two forms, because an asp page cannot have two forms with runat=server and because I'm using a python cgi script which seems  to only recover the elements of one form not two.

Any ideas on what I can do?  Thanks
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