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POGenerating ASP.NET Controls code-behind
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  1. POGenerating ASP.NET Controls code-behind
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    copied!<p>In a gridview, I have a column I use for images, using a template:</p> <pre><code>&lt;asp:TemplateField HeaderText="Image"&gt; &lt;EditItemTemplate&gt; &lt;%#GenerateControl(Eval("id").toString) %&gt; &lt;/EditItemTemplate&gt; &lt;ItemTemplate&gt; &lt;%#GetImageById(Eval("id"))%&gt; &lt;/ItemTemplate&gt; &lt;/asp:TemplateField&gt; </code></pre> <p>I want generate a control, depending on wether the image exists or not. The code I use for doing this in the code behind is:</p> <pre><code>Protected Function GenerateControl(ByVal id As String) As String Dim scrString As String = "../../Assets/Zalen/" + id + ".jpg" Dim strImageUrl As String = Me.Server.MapPath(scrString) If Not File.Exists(strImageUrl) Then Return "&lt;asp:FileUpload ID=""FileUpload1"" runat=""server"" /&gt;" Else Return "&lt;asp:button ID=""Button1"" runat=""server"" Text=""Verwijder afbeelding"" OnClick=""DeleteImage(" + id + ")""/&gt;" End If End Function </code></pre> <p>This is method is invoked by the GridView.Updating event.</p> <p>So, basicly: If the image exists I want to show a button so that the user is able to delete the image. If the image does not yet exist (images are based on the primary key of the table ("id")) then I want to show a FileUpload control.</p> <p>The controls show up in the HTML code when I run the website, but they do not show up on the website itself. (ie: visible through code, not visually)</p> <p>How do I correctly render controls dynamicly into a GridView? Thanks</p>
 

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