<com:TContent ID="Content"> <h1>Validations Triggered by TCheckBox</h1> <com:TTextBox ID="TextBox1" /> <com:TRequiredFieldValidator Text="Textbox1 required" ControlToValidate="TextBox1" ValidationGroup="Group1" /> <com:TCheckBox Text="Submit1" AutoPostBack="true" ValidationGroup="Group1" OnCheckedChanged="button1Clicked" /> <com:TLabel ID="Result1" /> <hr/> <com:TTextBox ID="TextBox2" /> <com:TRequiredFieldValidator Text="Textbox2 required" ControlToValidate="TextBox2" /> <com:TCheckBox Text="Submit2" AutoPostBack="true" OnCheckedChanged="button2Clicked" /> <com:TLabel ID="Result2" /> <hr/> <com:TTextBox ID="TextBox3" /> <com:TRequiredFieldValidator Text="Textbox3 required" EnableClientScript="false" ControlToValidate="TextBox3" ValidationGroup="Group3" /> <com:TCheckBox Text="Submit3" AutoPostBack="true" ValidationGroup="Group3" OnCheckedChanged="button3Clicked" /> <com:TLabel ID="Result3" /> </com:TContent>