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RadCheckBox can be placed in a right-to-left environment without issues in its appearance or functionality.
In order to switch a RadCheckBox to RTL mode, you should set dir=rtl to its parent HTML element or use the direction:rtl CSS property. You can also do this globally for the page, e.g., on the <body>, <form> or <html> element.
dir=rtl
direction:rtl
<%@ Page Language="C#" AutoEventWireup="true" %> <%@ 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-thin" style="direction: rtl; text-align: center;"> <telerik:RadCheckBox runat="server" ID="RadCheckBox1" Checked="true" Text="پذیرفتن" AutoPostBack="false"> </telerik:RadCheckBox> </div> </form> </body> </html>