Validation groups allow you to assign validation controls on a page to a specific category. Each validation group can be validated independently of other validation groups on the page. Use the Button.ValidationGroup property to specify the name of the validation group for which the System.Web.UI.WebControls.Button control causes validation when it posts back to the server.

This property has an effect only when the value of the Button.CausesValidation property is set to true. When you specify a value for the Button.ValidationGroup property, only the validation controls that are part of the specified group are validated when the System.Web.UI.WebControls.Button control posts back to the server. If you do not specify a value for this property and the Button.CausesValidation property is set to true, all validation controls on the page that are not assigned to a validation group are validated when the control posts back to the server.

This property cannot be set by themes or style sheet themes. For more information, see System.Web.UI.ThemeableAttribute and ASP.NET Themes Overview.