Gets or sets the client-side script that executes when a System.Web.UI.WebControls.Button control's Button.Click event is raised.
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Use the Button.OnClientClick property to specify additional client-side script that executes when a System.Web.UI.WebControls.Button control's Button.Click event is raised. The script that you specify for this property is rendered in the System.Web.UI.WebControls.Button control's OnClick attribute in addition to the control's predefined client-side script.
This property cannot be set by themes or style sheet themes. For more information, see System.Web.UI.ThemeableAttribute and ASP.NET Themes Overview.