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    <p>autopostback="true" on your textbox is causing this, since both controls are reloaded after they leave the textbox. I doubt there is a way to avoid this as long as they are in the same UpdatePanel. </p> <p>Maybe you could set focus to the dropdown list after the textbox-initiated postback, or you could probably make this work by putting the controls in separate UpdatePanels. But really it seems the wrong way to go about it. I would use javascript (and ajax if the logic is complicated) to update the APY. Or just add a "calculate" button...</p> <p>(Edit) Here's a slightly ugly hack to avoid ajax, three update panels and still be able to do your logic server side. I do not approve of this method but it is quick and dirty.</p> <p>Put the Label control that contains the calculation results in an UpdatePanel. The input controls do not need to be in an UpdatePanel.</p> <p>In the update panel (with the results) have a hidden submit button:</p> <pre><code> &lt;asp:Button ID="DoCalculate" style="display:none;" UseSubmitBehavior="false" runat="server" OnClick="Recalculate()" /&gt; </code></pre> <p>This should be the trigger for the UpdatePanel. Then have your two input controls click that button using javascript to cause a partial postback to the "results" panel. Here is the code to add this javascript for the dropdown, for example, in <code>Page_Load</code>:</p> <pre><code> ddSelectedTerm.Attributes.Add("onSelectedIndexChanged", "document.getElementByID('" + DoCalculate.ClientID + "').Click()"); </code></pre> <p>Then in put the C# code to do the calculation and update the label in the 2nd update panel in the "Recalculate()" method.</p> <p>This should work, and give you better layout control and less code flow ugliness then using 3 update panels.</p>
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    1. POUpdate Panel - Textbox TextChanged Event is interfering with the DropDown SelectedIndexChanged event
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    1. USJamie Treworgy
    1. USJamie Treworgy
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    1. COI tried separate update panels and if the textbox is changed then it doesn't have knowledge of the drop down having a value despite me plainly seeing that it does have one.
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      1. UShyprsleepy
    2. COI just tried putting the two controls in separate UpdatePanels and the result field in a third one (automatically updated), and doing the calculation for the result on page_load and it works as expected. You don't need any server-side events for ontextchanged and onselectedindexchanged. Still, though, this is a ton of overhead to do something that can be done with a few lines of javascript.
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      1. USJamie Treworgy
    3. COSo you are saying that 3 update panels works? Wow.
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      1. UShyprsleepy
 

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