I would like to note that Telerik UI for WinForms suite offers RadTextBox and RadTextBoxControl. Could you please specify which one you are using? I suppose that you are referring to RadTextBox since it supports RightToLeft functionality.
In order to hide the bottom border, please have a look at the default code snippet which demonstrates a sample approach how to manage all the borders around RadTextBox:
I hope this information helps. If you need any further assistance please don't hesitate to contact me.
Regards,
Dess | Tech Support Engineer, Principal
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hi
this atach image is a textbox control