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POAsp.Net ListView how to delete a row without deleting from datasource
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  1. POAsp.Net ListView how to delete a row without deleting from datasource
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    copied!<p>Through <code>CommandName="Delete"</code> I try to delete a line from the ListView control but not from the datasource. On Pressing Delete I expect the webpage to reload and show me the updated ListView(with one line deleted). But nothing changes, the ListView will display the same content after pressing Delete. What do I do wrong?</p> <pre><code> &lt;asp:ListView ID="ListView1" DataSourceID="XmlDataSource1" ItemContainerId="DataSection" runat="server"&gt; &lt;LayoutTemplate&gt; &lt;h3&gt;Protocols to Upload...&lt;/h3&gt; &lt;table border=0 style="background-color:#9C9EFF; width: 100%;"&gt; &lt;tr align=left&gt; &lt;th&gt;Region/Exam/Program&lt;/th&gt;&lt;th&gt;Protocol&lt;/th&gt;&lt;th&gt;Position&lt;/th&gt; &lt;/tr&gt; &lt;asp:PlaceHolder ID="itemPlaceholder" runat="server"&gt;&lt;/asp:PlaceHolder&gt; &lt;/table&gt; &lt;/LayoutTemplate&gt; &lt;ItemTemplate&gt; &lt;tr&gt; &lt;td&gt;&lt;%#XPath("Location/Path")%&gt;&lt;/td&gt; &lt;td&gt;&lt;%#XPath("Location/Name")%&gt;&lt;/td&gt; &lt;td&gt;&lt;%#XPath("Location/Position")%&gt;&lt;/td&gt; &lt;td style="width:40px"&gt; &lt;asp:LinkButton ID="SelectCategoryButton" runat="server" Text="Select" CommandName="Select"/&gt; &lt;/td&gt; &lt;/tr&gt; &lt;/ItemTemplate&gt; &lt;SelectedItemTemplate&gt; &lt;tr id="Tr1" runat="server" style="background-color:#F7F3FF"&gt; &lt;td&gt;&lt;%#XPath("Location/Path")%&gt;&lt;/td&gt; &lt;td&gt;&lt;%#XPath("Location/Name")%&gt;&lt;/td&gt; &lt;td&gt;&lt;%#XPath("Location/Position")%&gt;&lt;/td&gt; &lt;td style="width:40px"&gt; &lt;asp:LinkButton runat="server" ID="SelectCategoryButton" Text="Delete" CommandName="Delete" /&gt; &lt;/td&gt; &lt;/tr&gt; &lt;/SelectedItemTemplate&gt; &lt;%-- &lt;ItemSeparatorTemplate&gt; &lt;div style="height: 0px;border-top:dashed 1px #ff0000"&gt;&lt;/div&gt; &lt;/ItemSeparatorTemplate&gt;--%&gt; &lt;/asp:ListView&gt; &lt;asp:XmlDataSource ID="XmlDataSource1" XPath="HttpRequestBO/ProtocolsDTO/ProtocolDTO" runat="server" DataFile="~/HttpRequestBo.Sample.xml"&gt;&lt;/asp:XmlDataSource&gt; </code></pre> <p>And this is the code behind:</p> <pre><code>protected void Page_Load(object sender, EventArgs e) { } protected void ListView1_OnItemDeleted(Object sender, ListViewDeletedEventArgs e) { if (e.Exception != null) { e.ExceptionHandled = true; } } protected void ListView1_OnItemCommand(object sender, ListViewCommandEventArgs e) { if (String.Equals(e.CommandName, "Delete")) { ListViewDataItem dataItem = (ListViewDataItem)e.Item; ListView1.Items.Remove(dataItem); } } </code></pre> <p>If I don't use the <code>e.ExceptionHandled = true;</code>, after pressing the Delete link the web page will come up with a "Specified method is not supported." message. Why?</p> <p>If I use the above mentioned line, then the page refreshes but I can still see all original lines (although on debugging I can see that the ListVieItem collection now only contains an item less.)</p>
 

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