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    <p>This is because you are trying to access an HTML element on the server side as a server side control. You could make your <code>select</code> element into a server side control by simply adding <code>runat="server"</code> to it like such:</p> <pre><code>&lt;select id="ExTypeDD" runat="server" class="Nbr1" style="width:90px"&gt; </code></pre> <p>But after that you would still have the issue that this control, although accessible on the server side now, it does not have the id of ExTypeDD because it is dynamically created in the ItemTemplate of your ListView which generates a unique ID value for each newly created control . You can verify this by viewing source on the page rendered in the browser and checking the ID value on the select element.</p> <p>To do what you're trying to do on the server side you would need to do something along the lines of this:</p> <p>Add an onItemCreated event handler to your ListView:</p> <pre><code>&lt;asp:ListView runat="server" id="ListView1" onItemCreated="ListView1ItemCreated"&gt; </code></pre> <p>Replace this:</p> <pre><code>&lt;input type="button" id="btn_update" class="Updt" value="Update" /&gt; </code></pre> <p>With this:</p> <pre><code>&lt;asp:button id="btn_update" text="Update" runat="server" /&gt; </code></pre> <p>Add the event handler to the code behind:</p> <pre><code>protected void ListView1ItemCreated(object sender, ListViewItemEventArgs e){ var myselect = (HtmlSelect)e.Item.FindControl("ExTypeDD"); var mybutton = (Button)e.Item.FindControl("btn_update"); mybutton.OnSubmit += (o,e) =&gt; { // do something with myselect selected value var selectedvalue = myselect.Value; }; } </code></pre> <p><strong>NOTE: the above code is not tested and probably won't compile, you will need to make necessary corrections, but it should give you the idea for a way to solve your problem. Hope it helps.</strong></p>
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    1. PO.NET/html, element does not exist error when selecting dropdown.ClientID
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    1. USDmitry Samuylov
    1. USDmitry Samuylov
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    1. COI unfortunately must use HTML type buttons and not asp buttons as they are more manangeable for end users.
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    2. COwhat do you mean by "more manageable"?
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      1. USDmitry Samuylov
    3. COIn that case you can not access the button or the select element on the server side directly as you would do with a server sie control, so you should use a client side solution along the lines of @jbl's answer
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      1. USDmitry Samuylov
 

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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

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