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POhow to delete dynamic created textbox controls on dropdownlist selectedIndexChanged event and recreate new dynamic control on new selected value
 

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  1. POhow to delete dynamic created textbox controls on dropdownlist selectedIndexChanged event and recreate new dynamic control on new selected value
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    <pre><code> Aspx page: &lt;table border="0" cellpadding="0" cellspacing="0"&gt; &lt;tr&gt; &lt;td&gt; &lt;asp:placeholder id="container" runat="server" visible="false"&gt;&lt;/asp:placeholder&gt; &lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; On Code Behind file: protected override void OnLoad(EventArgs e) { base.OnLoad(e); generateDynamicControls(); } private void generateDynamicControls() { for (int i = 0; i &lt; dt.Rows.Count; i++) { HtmlGenericControl tr = new HtmlGenericControl("tr"); HtmlGenericControl td1 = new HtmlGenericControl("td"); Label lbl = new Label(); lbl.ID = "lbl" + dt.Rows[i]["sSubjectName"].ToString(); lbl.Text = dt.Rows[i]["sSubjectName"].ToString() + " :"; lbl.Width = new Unit(170); lbl.Style.Add("padding-left", "10px"); lbl.Style.Add("font-weight", "bold"); td1.Controls.Add(lbl); tr.Controls.Add(td1); HtmlGenericControl td2 = new HtmlGenericControl("td"); TextBox txtBox = new TextBox(); txtBox.ID = "txt" + dt.Rows[i]["sSubjectName"].ToString(); txtBox.CssClass = "TxtBox"; txtBox.TextMode = TextBoxMode.MultiLine; txtBox.Width = new Unit(840); td2.Style.Add("colspan", "3"); td2.Controls.Add(txtBox); tr.Controls.Add(td2); container.Controls.Add(tr); HtmlGenericControl tr1 = new HtmlGenericControl("tr"); HtmlGenericControl td3 = new HtmlGenericControl("td"); td3.Style.Add("colspan", "4"); td3.InnerHtml = "&amp;nbsp;"; tr1.Controls.Add(td3); container.Controls.Add(tr1); //container.Controls.Add(new LiteralControl("&lt;br /&gt;")); //LiteralControl literalBreak = new LiteralControl(); //literalBreak.Text ="&lt;/br&gt;"; } container.Visible = true; } } `dt(datatable)` is filled from other function. </code></pre> <p>this is working fine and controls are created correclty.</p> <p>But I want to recreate this dynamic controls on selected change event of dropdownlist. but before recreate these controls i have to delete previously created controls. </p> <p>I have tried below code in dropdownlist selected changed event to delete these controls and recreate new controls.</p> <pre><code>for (int i = 0; i &lt; dt.Rows.Count; i++) { container.Controls.Remove(container.FindControl(dt.Rows[i]["nSubjectId"].ToString())); } generateDynamicControls(); </code></pre> <p>But it's not work and give me following error. becuase of onload event is alread ycalled first and created the dyanmic controls.</p> <p>Multiple controls with the same ID '<em>lblOrals</em>' were found. FindControl requires that controls have unique IDs.</p> <p>How can I solve this problem.</p> <p>Please help me solve this problem.</p> <p>Thanks in advance</p>
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      1. POhow to delete dynamic created textbox controls on dropdownlist selectedIndexChanged event and recreate new dynamic control on new selected value
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