Use custom validator in webform and server side code

I have a web form that has several asp.net validation controls on it. I have one textbox that is using a function to validate the textbox contents against a SQL server database.   I have the coding complete but I want to use a validator control to indicate if the textbox contents passed or failed so that it becomes part of the page validation along with the other validation controls on the form.

I tried setting the customvalidator.isvalid = false but it does not see to work.

How can I do this?
Mike_StevensAsked:
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Randy PooleCommented:
Add a custom validator control to the page and point it at the textbox you want to validate
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Mike_StevensAuthor Commented:
How will it know if the text in the textbox is valid?
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Randy PooleCommented:
the validator runs a function on the code behind and you specify if it is valid as such in this instance it will call the function ValidatePasswordConfirmation:
aspx page
                    <label for="ConfirmPassword">
                        Password again:</label></dt><dd>
                    <asp:TextBox ID="ConfirmPassword" runat="server" AutoCompleteType="Disabled"
                            CssClass="PersonName" TextMode="Password" MaxLength="100" />
                            <asp:RequiredFieldValidator ID="reqConfirmPassword" runat="server" ControlToValidate="ConfirmPassword"
                                Display="None" ErrorMessage="Password confirmation can't be blank" />
                            <asp:CustomValidator ID="CustomValidatorPasswordConfirmation" runat="server"
                                Display="None" ErrorMessage="Password confirmation doesn't match." OnServerValidate="ValidatePasswordConfirmation"></asp:CustomValidator>

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cs
     
  protected void ValidatePasswordConfirmation( object sender, ServerValidateEventArgs e )
        {
            bool result = true;
            if (Password.Text != ConfirmPassword.Text)
            {
                result = false;
                CustomValidatorPasswordConfirmation.ErrorMessage = "Password confirmation doesn't match original password";
            }
            if (!string.IsNullOrEmpty(Password.Text) && result)
            {
                string o = lic.validatepw(Password.Text);
                result = o.Length == 0;
                if (!result) CustomValidatorPasswordConfirmation.ErrorMessage = o;
            }
            e.IsValid = result;
        }

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