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POMultiple controls with the same ID were found
 

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  1. POMultiple controls with the same ID were found
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    <p>I have following asp.net code but it gives error when I change dropdown selected index:</p> <pre><code>&lt;asp:UpdatePanel&gt; &lt;ContentTemplate&gt; &lt;asp:DropDownList ID="drp" runat="server" AutoPostBack="true" OnSelectedIndexChanged="drp_SelectedIndexChanged"&gt; &lt;asp:ListItem Text="ABC" Value="ABC"&gt;&lt;/asp:ListItem&gt; &lt;asp:ListItem Text="DEF" Value="DEF"&gt;&lt;/asp:ListItem&gt; &lt;/asp:DropDownList&gt; &lt;asp:Panel ID="pnl" runat="server"&gt; &lt;/asp:Panel&gt; &lt;asp:Button ID="Button1" runat="server" Text="Submit" OnClick="Button1_Click" /&gt; &lt;/ContentTemplate&gt; &lt;Triggers&gt; &lt;asp:PostBackTrigger ControlID="drp" /&gt; &lt;asp:PostBackTrigger ControlID="Button1" /&gt; &lt;/Triggers&gt; &lt;/asp:UpdatePanel&gt; </code></pre> <p>Now made one function for create textbox and get textbox value into lable as following way</p> <pre><code>protected void drp_SelectedIndexChanged(object sender, EventArgs e) { if (drp.SelectedIndex != 0) { ViewState["controls"] = true; CreateTextbox(drp.SelectedIndex); } } private void CreateTextbox(int Number) { try { TextBox txtTextbox; Label lbltxtTextbox; for (int i = 0; i &lt; Number; i++) { txtTextbox = new TextBox(); txtTextbox.ID = "txtbox" + i; lbltxtTextbox = new Label(); lbltxtTextbox.ID = "lbltxtbox" + i; pnl.Controls.Add(txtTextbox); pnl.Controls.Add(lbltxtTextbox); } } catch (Exception ex) { } } private void GetTextboxvalue(int Number) { try { TextBox txtTextbox; Label lbltxtTextbox; for (int i = 0; i &lt; Number; i++) { txtTextbox = (TextBox)pnl.FindControl("txtbox" + i); lbltxtTextbox = (Label)pnl.FindControl("lbltxtbox" + i); lbltxtTextbox.Text = txtTextbox.Text; } } catch (Exception ex) { } } protected void Button1_Click(object sender, EventArgs e) { GetTextboxvalue(drp.SelectedIndex); } protected void Page_Load(object sender, EventArgs e) { if (ViewState["controls"] != null) if (drp.SelectedIndex != 0) { CreateTextbox(drp.SelectedIndex); } } </code></pre> <p>error is:</p> <pre><code>Multiple controls with the same ID 'txtbox0' were found. FindControl requires that controls have unique IDs. </code></pre>
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    1. This table or related slice is empty.
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    1. USSai Kalyan Kumar Akshinthala
    1. USDotnetSparrow
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    1. This table or related slice is empty.
    1. COView the html source from your browser which will help you to find all the rendered controls.
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      1. POMultiple controls with the same ID were found
      1. USKiru
    2. COif you change your dropdown list twice to the same item you make the same textboxe twice and so you end up with the same ids.
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      1. POMultiple controls with the same ID were found
      1. USBazzz
    3. CODepending on what you exactly want to do, maybe you should call pnl.Controls.Clear() as first statement of your try block.
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      1. POMultiple controls with the same ID were found
      1. USjbl
 

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