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PODynamically added controls missing during GridView RowUpdating
 

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  1. PODynamically added controls missing during GridView RowUpdating
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    <p>I have a GridView with a TemplateField column that I put PlaceHolder controls in. During the DataBound event for the GridView I dynamically add a few CheckBoxes to the PlaceHolder. That works fine and displays as expected.</p> <p>My problem is that during the RowUpdating event the PlaceHolder contains no controls; my CheckBoxes are missing. I also noticed that they're missing during the RowEditing event.</p> <p>I want to be able to get the values of the CheckBoxes during the RowUpdating event so I can save them to the database.</p> <p>Here's some example code. I've trimmed out a lot to reduce size, but if you want to see specifics just ask and I'll be happy to add more.</p> <p>HTML:</p> <pre><code>&lt;asp:GridView ID="gridView" runat="server" AutoGenerateColumns="False" ondatabound="gridView_DataBound" onrowupdating="gridView_RowUpdating" onrowediting="gridView_RowEditing" DataKeyNames="ID"&gt; &lt;Columns&gt; &lt;asp:TemplateField HeaderText="Countries"&gt; &lt;ItemTemplate&gt; &lt;asp:PlaceHolder ID="countriesPlaceHolder" runat="server"&gt;&lt;/asp:PlaceHolder&gt; &lt;/ItemTemplate&gt; &lt;EditItemTemplate&gt; &lt;asp:PlaceHolder ID="countriesPlaceHolder" runat="server"&gt;&lt;/asp:PlaceHolder&gt; &lt;/EditItemTemplate&gt; &lt;/asp:TemplateField&gt; &lt;asp:TemplateField ShowHeader="False"&gt; &lt;ItemTemplate&gt; &lt;asp:LinkButton ID="editButton" runat="server" CommandName="Edit" Text="Edit"&gt;&lt;/asp:LinkButton&gt; &lt;/ItemTemplate&gt; &lt;EditItemTemplate&gt; &lt;asp:LinkButton ID="updateButton" runat="server" CommandName="Update" Text="Update"&gt;&lt;/asp:LinkButton&gt; &lt;/EditItemTemplate&gt; &lt;/asp:TemplateField&gt; &lt;/Columns&gt; &lt;/asp:GridView&gt; </code></pre> <p>Code behind:</p> <pre><code>// This method works fine, no obvious problems here. protected void gridView_DataBound(object sender, EventArgs e) { // Loop through the Holidays that are bound to the GridView var holidays = (IEnumerable&lt;Holiday&gt;)gridView.DataSource; for (int i = 0; i &lt; holidays.Count(); i++) { // Get the row the Holiday is bound to GridViewRow row = gridView.Rows[i]; // Get the PlaceHolder control var placeHolder = (PlaceHolder)row.FindControl("countriesPlaceHolder"); // Create a CheckBox for each country and add it to the PlaceHolder foreach (Country country in this.Countries) { bool isChecked = holidays.ElementAt(i).Countries.Any(item =&gt; item.ID == country.ID); var countryCheckBox = new CheckBox { Checked = isChecked, ID = country.Abbreviation + "CheckBox", Text = country.Abbreviation }; placeHolder.Controls.Add(countryCheckBox); } } } protected void gridView_RowEditing(object sender, GridViewEditEventArgs e) { // EXAMPLE: I'm expecting checkBoxControls to contain my CheckBoxes, but it's empty. var checkBoxControls = gridView.Rows[e.NewEditIndex].FindControl("countriesPlaceHolder").Controls; gridView.EditIndex = e.NewEditIndex; BindData(); } protected void gridView_RowUpdating(object sender, GridViewUpdateEventArgs e) { // EXAMPLE: I'm expecting checkBoxControls to contain my CheckBoxes, but it's empty. var checkBoxControls = ((PlaceHolder)gridView.Rows[e.RowIndex].FindControl("countriesPlaceHolder")).Controls; // This is where I'd grab the values from the controls, create an entity, and save the entity to the database. gridView.EditIndex = -1; BindData(); } </code></pre> <p>This is the article that I followed for my data binding approach: <a href="http://www.aarongoldenthal.com/post/2009/04/19/Manually-Databinding-a-GridView.aspx" rel="nofollow">http://www.aarongoldenthal.com/post/2009/04/19/Manually-Databinding-a-GridView.aspx</a></p>
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    1. COare you casting the place holder variable properly for example PlaceHolder placeHolder = e.Row.FindControl("countriesPlaceHolder") as PlaceHolder; you also need to check the RowType if( if (e.Row.RowType == DataControlRowType.DataRow) then put your code for PlaceHolder instance after that.. try that..
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    2. COYeah, in my actual code I do cast it to a PlaceHolder. I also perform a check on the RowType as you suggested. Thanks for the suggestion.
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    3. COI can't see where you are checking the RowType..
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