ASP.Net CustomValidator Control

CustomValidator: The CustomValidator control allows writing application specific custom validation method for both the client side and the server side validation.

·         The client side validation is accomplished through the ClientValidationFunction property. The client side validation method should be written in a scripting language, like JavaScript, jQuery etc., which the browser can understand.

·         The server side validation method must be called from the controls OnServerValidate event handler. The server side validation routine should be written in any .Net language, like C# or VB.Net.

CustomValidator additional properties (Check here for other default properties and sample):

Property	Description
ClientValidationFunction	Specifies the name of the client-side validation script function to be executed.  Note: The script must be in a language that the browser supports, i.e. JavaScript, jQuery. Example of client side function: Function FunctionName (source, arguments)
OnServerValidate	Specifies the name of the server-side validation script function to be executed

  Custom Validation Control:

<asp:CustomValidator ID="cvTest" runat="server"        ClientValidationFunction="ValidateMethodName"        ErrorMessage="*Required"> </asp:CustomValidator>