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    <p>Currently I've solved it with javascript and I can use normal validators.</p> <pre><code>&lt;script language="javascript" type="text/javascript"&gt; function CheckPhoneValidator(txtEmail) { var phoneValidator = document.getElementById('&lt;%= ReqPhone.ClientID %&gt;'); ValidatorEnable(phoneValidator, txtEmail.value == '' ? true : false); } function CheckEmailValidator(txtPhone) { var emailValidator = document.getElementById('&lt;%= ReqEmail.ClientID %&gt;'); var emailRegexValidator = document.getElementById('&lt;%= RegexEmail.ClientID %&gt;'); ValidatorEnable(emailValidator, txtPhone.value == '' ? true : false); ValidatorEnable(emailRegexValidator, txtPhone.value == '' ? true : false); } </code></pre> <p></p> <p>And these are the controls:</p> <pre><code>&lt;tr&gt; &lt;td&gt; E-mail adres: &lt;/td&gt; &lt;td&gt; &lt;asp:TextBox ID="TxtEmail" runat="server" onchange="javascript:CheckPhoneValidator(this);"&gt;&lt;/asp:TextBox&gt; &lt;asp:RequiredFieldValidator ID="ReqEmail" runat="server" ControlToValidate="TxtEmail" ErrorMessage="U moet een e-mail invullen als u geen telefoonnummer heeft ingevuld." Display="Dynamic" ValidationGroup="Contact"&gt;&amp;nbsp;&lt;/asp:RequiredFieldValidator&gt; &lt;asp:RegularExpressionValidator ID="RegexEmail" runat="server" ControlToValidate="TxtEmail" ErrorMessage="Dit is geen geldig e-mail adres." Display="Dynamic" ValidationExpression="([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})" ValidationGroup="Contact"&gt;&amp;nbsp;&lt;/asp:RegularExpressionValidator&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt; Telefoonnummer: &lt;/td&gt; &lt;td&gt; &lt;asp:TextBox ID="TxtPhone" runat="server" onchange="javascript:CheckEmailValidator(this);"&gt;&lt;/asp:TextBox&gt; &lt;asp:RequiredFieldValidator ID="ReqPhone" runat="server" ControlToValidate="TxtPhone" ErrorMessage="U moet een telefoonnummer invullen als u geen e-mail heeft ingevuld." Display="Dynamic" ValidationGroup="Contact"&gt;&amp;nbsp;&lt;/asp:RequiredFieldValidator&gt; &lt;/td&gt; &lt;/tr&gt; </code></pre>
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