I have this simple text box to input an e-mail address.
Email Address <asp:TextBox ID="anTxbEmail" runat="server" AutoPostBack="true" OnTextChanged="CheckAccountExistence" Width="160px" BackColor="#00CC00" BorderColor="#00CC66" Font-Names="Calibri"></asp:TextBox>
Then I have attached a RequiredField validator....
<asp:RequiredFieldValidator ID="rfEmailAddress" runat="server" ControlToValidate="anTxbEmail" ErrorMessage="Email Required." Display="Dynamic" SetFocusOnError="true" />
Then I have attached a Validation Summary...
<asp:ValidationSummary ID="ValidationSummary" ShowSummary="False" ShowMessageBox ="true" runat="server" />
Now the problem I have is when I click the OK button while having the email text box empty, yes it shows the error on the Message Box BUT it still shows the same error at the bottom of the page in spite of saying ShowSummary="False".
I suspect what you are seeing is not the validation summary but the validator itself, you need to set the Display property to None :
<asp:RequiredFieldValidator ID="rfEmailAddress" runat="server" ControlToValidate="anTxbEmail"
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