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Use the RadioButton.GroupName property to specify a grouping of radio buttons to create a mutually exclusive set of controls. You can use the RadioButton.GroupName property when only one selection is possible from a list of available options.
When this property is set, only one System.Web.UI.WebControls.RadioButton in the specified group can be selected at a time.
The value of this property is stored in view state.
This property cannot be set by themes or style sheet themes. For more information, see System.Web.UI.ThemeableAttribute and ASP.NET Themes Overview.