<%@ Title="An AutoPostBack CheckBox" %> <com:TContent ID="Content"> <h1>An AutoPostBack CheckBox</h1> <com:TCheckBox AutoPostBack="true" Text="Without ValidationGroup" ID="checkbox1" /> <br/> <com:TCheckBox AutoPostBack="true" Text="With ValidationGroup" ValidationGroup="Group" ID="checkbox2" /> <br/> <com:TCheckBox AutoPostBack="true" CausesValidation="false" Text="CausesValidation=false" ID="checkbox3" /> <br/> Input: <com:TTextBox ID="TextBox"/> <com:TRequiredFieldValidator ControlToValidate="TextBox" Display="Dynamic" ErrorMessage="input required in the textbox" ValidationGroup="Group" ID="validator1" /> <br/> </com:TContent>