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because For ValidationSummary and TextBox controls you have &nbsp; ValidationGroup=&quot;aaa&quot;<br />
but not for RequiredFieldValidatorCont<wbr />rol<br />
So set &nbsp;ValidationGroup=&quot;aaa&quot; for valRequired as well
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because For ValidationSummary and TextBox controls you have   ValidationGroup="aaa"
but not for RequiredFieldValidatorControl
So set  ValidationGroup="aaa" for valRequired as well

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Thanks. <br />
I have another related question. I have start a new question for it. Could you please help me with it. Thanks.<br />
<a href="https://www.experts-exchange.com/questions/24422405/ValidationSummary-does-not-show-error-message-from-CustomValidator.html" rel="ugc nofollow">https://www.experts-exchange.com/questions/24422405/ValidationSummary-does-not-show-error-message-from-CustomValidator.html</a><br />

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Thanks.
I have another related question. I have start a new question for it. Could you please help me with it. Thanks.
https://www.experts-exchange.com/questions/24422405/ValidationSummary-does-not-show-error-message-from-CustomValidator.html [https://www.experts-exchange.com/questions/24422405/ValidationSummary-does-not-show-error-message-from-CustomValidator.html]


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I used the following code to try ValidationSummary. But ValidationSummary &nbsp;does not show the error message. &nbsp;Please tell me what I missed. Thanks.<br />
<br />
&lt;asp:TextBox ID=&quot;txtRequired&quot; ValidationGroup=&quot;aaa&quot; runat=&quot;server&quot;&gt;&lt;/asp:TextB<wbr />ox&gt;<br />
&lt;asp:RequiredFieldValidato<wbr />r ID=&quot;valRequired&quot; &nbsp;Display=&quot;Static&quot; ControlToValidate=&quot;txtRequ<wbr />ired&quot; Text=&quot;*&quot; ErrorMessage=&quot;Required&quot; runat=&quot;server&quot;&gt;&lt;/asp:Requi<wbr />redFieldVa<wbr />lidator&gt;<br />
<br />
&lt;asp:ValidationSummary ID=&quot;val&quot; HeaderText=&quot;Error:&quot; Font-Names=&quot;verdana&quot; <br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Font-Size=&quot;12&quot; DisplayMode=&quot;BulletList&quot; &nbsp;Enabled=&quot;true&quot; &nbsp;ShowSummary=&quot;true&quot; &nbsp;ValidationGroup=&quot;aaa&quot; runat=&quot;server&quot; /&gt;<br />
<br />

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I used the following code to try ValidationSummary. But ValidationSummary  does not show the error message.  Please tell me what I missed. Thanks.

<asp:TextBox ID="txtRequired" ValidationGroup="aaa" runat="server"></asp:TextBox>
<asp:RequiredFieldValidator ID="valRequired"  Display="Static" ControlToValidate="txtRequired" Text="*" ErrorMessage="Required" runat="server"></asp:RequiredFieldValidator>

<asp:ValidationSummary ID="val" HeaderText="Error:" Font-Names="verdana" 
                Font-Size="12" DisplayMode="BulletList"  Enabled="true"  ShowSummary="true"  ValidationGroup="aaa" runat="server" />



ValidationSummary does not show error message

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