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You can easily attach RadSpell to a TextBox control by setting the "ControlToCheck" property to the ID of the TextBox control.
<%@ Page %> <%@ Register TagPrefix="telerik" Namespace="Telerik.Web.UI" Assembly="Telerik.Web.UI" %> <!DOCTYPE html> <html xmlns='http://www.w3.org/1999/xhtml'> <head runat="server"> <title>Telerik ASP.NET Example</title> </head> <body> <form id="form1" runat="server"> <telerik:RadScriptManager runat="server" ID="RadScriptManager1" /> <telerik:RadSkinManager ID="RadSkinManager1" runat="server" ShowChooser="true" /> <div class="demo-container size-narrow"> <asp:TextBox ID="textBox1" runat="server" Width="100%" Height="100px" TextMode="MultiLine">Thisz is a server side TextBox with some delibirate mistakees.</asp:TextBox> <br /> <telerik:RadSpell RenderMode="Lightweight" ID="spell1" runat="server" ControlToCheck="textBox1"></telerik:RadSpell> </div> </form> </body> </html>