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PODynamic Control’s Event Handler’s Working
 

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    <p>I have following code that adds dynamic LinkButton on the click event of a normal button. The LinkButtons need a EventHandler <code>“LinkButton_Click“</code>. Since the event handler need to be registered while <code>Page_Load/Page_Init</code> itself, I am first adding all the possible links within <code>Page_Load</code> (in postback scenario). (There are totally fours linkbuttons; only two will be displayed in the screen based on business scenario)</p> <p>The code is working fine and the event handlers are getting invoked on click event. </p> <p><strong>Note:</strong> The business scenario is – if the current time’s second portion is less than 30, the first two LinkButtons need to be displayed; if greater than 30 the last two LinkButtons need to be displayed. </p> <p><strong>Note:</strong> The controls are cleared and added again inside <code>PopulateLinksBasedOnCriteria()</code> method</p> <p><strong>QUESTIONS</strong></p> <ol> <li>In the <code>PopulateLinksBasedOnCriteria()</code> method, I am newly creating the link button instances. Still the event handler is firing. This is working because the ID that got added in the <code>Page_Load</code> is same. Is there any MSDN reference that substantiate this behavior? (I.e. the event handler will be based on the IDs registered while <code>Page_Load/Page_Init</code>. This will work even if the controls are cleared and added again)</li> <li>There is duplicate code in creating LinkButtons – one inside <code>Page_Load</code> and other inside <code>PopulateLinksBasedOnCriteria()</code> method. Is there a better way to achieve this business task without duplicate code?</li> </ol> <p><strong>MarkUp</strong></p> <pre><code>&lt;form id="form1" runat="server"&gt; &lt;div&gt; &lt;asp:Button ID="btnAdd" runat="server" Text="Add" OnClick="btnAdd_Click" /&gt; &lt;br /&gt; &lt;asp:PlaceHolder ID="plhDynamicLinks" runat="server"&gt;&lt;/asp:PlaceHolder&gt; &lt;/div&gt; &lt;/form&gt; </code></pre> <p><strong>CODE BEHIND</strong></p> <pre><code> protected void Page_Load(object sender, EventArgs e) { if (Page.IsPostBack) { LinkButton lnk1 = new LinkButton(); lnk1.ID = "D1"; lnk1.Text = "A"; //Event handler must be registered in the Page_Load/Page_Init lnk1.Click += new EventHandler(LinkButton_Click); plhDynamicLinks.Controls.Add(lnk1); LinkButton lnk2 = new LinkButton(); lnk2.ID = "D2"; lnk2.Text = "B"; lnk2.Click += new EventHandler(LinkButton_Click); plhDynamicLinks.Controls.Add(lnk2); LinkButton lnk3 = new LinkButton(); lnk3.ID = "D3"; lnk3.Text = "C"; lnk3.Click += new EventHandler(LinkButton_Click); plhDynamicLinks.Controls.Add(lnk3); LinkButton lnk4 = new LinkButton(); lnk4.ID = "D4"; lnk4.Text = "D"; lnk4.Click += new EventHandler(LinkButton_Click); plhDynamicLinks.Controls.Add(lnk4); } } protected void LinkButton_Click(object sender, EventArgs e) { PopulateLinksBasedOnCriteria(); LinkButton clickedControl = (LinkButton)sender; Response.Write(DateTime.Now.ToString()+"___"+ clickedControl.ID + " Link Button Clicked" ); } protected void btnAdd_Click(object sender, EventArgs e) { PopulateLinksBasedOnCriteria(); } private void PopulateLinksBasedOnCriteria() { plhDynamicLinks.Controls.Clear(); if (DateTime.Now.Second &lt; 30) { LinkButton linkButton1 = new LinkButton(); linkButton1.ID = "D1"; linkButton1.Text = "1"; plhDynamicLinks.Controls.Add(linkButton1); LinkButton linkButton2 = new LinkButton(); linkButton2.ID = "D2"; linkButton2.Text = "2"; plhDynamicLinks.Controls.Add(linkButton2); } else { LinkButton linkButton3 = new LinkButton(); linkButton3.ID = "D3"; linkButton3.Text = "3"; plhDynamicLinks.Controls.Add(linkButton3); LinkButton linkButton4 = new LinkButton(); linkButton4.ID = "D4"; linkButton4.Text = "4"; plhDynamicLinks.Controls.Add(linkButton4); } } </code></pre>
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