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POASP.NET Form Validation Doesn't work first time
 

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    <pre><code>&lt;asp:UpdatePanel ID="LoginPanel" UpdateMode="Conditional" runat="server"&gt; &lt;ContentTemplate&gt; &lt;div id="login"&gt; &lt;div class="row"&gt; &lt;div class="label"&gt; &lt;asp:Label ID="lblUsername" Text="&lt;%$ Resources:Login, UserNameField %&gt;" runat="server" /&gt; &lt;/div&gt; &lt;div class="field"&gt; &lt;asp:TextBox ID="txtUsername" MaxLength="12" runat="server" /&gt; &lt;asp:RequiredFieldValidator ID="rfvUsername" ControlToValidate="txtUsername" ValidationGroup="vgLogin" SetFocusOnError="true" ErrorMessage="*" ToolTip="&lt;%$ Resources:Login, UserNameRequired %&gt;" runat="server" /&gt; &lt;/div&gt; &lt;/div&gt; &lt;div class="row"&gt; &lt;div class="label"&gt; &lt;asp:Label ID="lblPassword" Text="&lt;%$ Resources:Login, PasswordField %&gt;" runat="server" /&gt; &lt;/div&gt; &lt;div class="field"&gt; &lt;asp:TextBox ID="txtPassword" MaxLength="12" TextMode="Password" runat="server" /&gt; &lt;asp:RequiredFieldValidator ID="rfvPassword" ControlToValidate="txtPassword" ValidationGroup="vgLogin" SetFocusOnError="true" ErrorMessage="*" ToolTip="&lt;%$ Resources:Login, PasswordRequired %&gt;" runat="server" /&gt; &lt;/div&gt; &lt;/div&gt; &lt;div class="row"&gt; &lt;div class="label"&gt; &lt;asp:Label ID="lblRemember" Text="&lt;%$ Resources:Login, RememberField %&gt;" runat="server" /&gt; &lt;/div&gt; &lt;div&gt; &lt;asp:CheckBox ID="chkRemember" Checked="true" ToolTip="&lt;%$ Resources:Login, RememberToolTip %&gt;" runat="server" /&gt; &lt;/div&gt; &lt;/div&gt; &lt;div class="buttons"&gt; &lt;asp:Button ID="btnLogin" Text="&lt;%$ Resources:Login, Command %&gt;" OnClick="btnLogin_Click" ValidationGroup="vgLogin" CausesValidation="true" runat="server" /&gt; &lt;/div&gt; &lt;/div&gt; &lt;/ContentTemplate&gt; &lt;/asp:UpdatePanel&gt; </code></pre> <p>The first time around, validators won't check whether the fields are completed or not, the form just gets submitted no matter what, after that initial hiccup, the form validates correctly each time.</p> <p>I know I can just ask (and should, regardless) if <code>Page.IsValid</code> at server-side, but I still would like the validation to correctly alert the user input mistake the first time around instead of waiting for the server response first.</p> <p>What am I doing wrong?</p>
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      1. POASP.NET Form Validation Doesn't work first time
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    1. COWhat version of asp.net are you using? The asp.net in validators in v2.0 don't work with updatepanels (because updatepanels didn't exists when v2.0 was released) but they do with v3.5. Also an example with text instead of the Resources:Login options would be preferred as it makes setting up a test case faster
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    2. COI'm using .net 4.0
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    3. COI tried the provided code sample, and couldn't simulate your case. I do recommend that you debug validation js using either I.E developer tools or firebug (start with `ValidatorOnLoad` and `ValidatorCommonOnSubmit` functions).
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