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Error Message
Single Require Field Validator with basic asp.net validation control's property as Error Message. Use this property to set basic ErrorMessage property of RequiredField Validator Control. e.g. If you want to set ToolTip propety of control as ErrorMessage, set ControlPropertyForErrorMessage="ToolTip". This will show ToolTip text of TextBox as error message. Same you can do with Text property of for validation control's Text.
 
<KSingle Required Field Validator is here >
<cc1:KSingleRequiredFieldValidator ControlPropertyForErrorMessage="ToolTip" EnableClientScript="False" ControlPropertyForText="ToolTip" ID="KSingleRequiredFieldValidator1" ValidationArea="EntireForm" runat="server"></cc1:KSingleRequiredFieldValidator >



Basic Controls at Page Level

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Text Box  
Drop Downlist  
List Box