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Hi MD. Mohiuddin Ahmed,
Controls, such as TextBox, have AutoComplete feature, see http://msdn.microsoft.com/en-us/library/system.windows.forms.textbox.autocompletemode.aspx.
Best Regards,
Bob Wu MSDN Community Support | Feedback to us Develop and promote your apps in Windows Store Please remember to mark the replies as answers if they help and unmark them if they provide no help.