c# - first key hit doesnt work in AutocompleteMenu from codeproject -

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actually new working c# . trying make autocomplete rich text box when found solution on codeproject website. problem having not work when hit first key. have tried lot doesnt seem working.

its rich text textbox autocompletes whatever write using dictionary. problem not when hit first key. works fine after that. e.g not work on "a" if write "ab" starts working.

can me out ? cant provide code long can surely provide guys link

http://www.codeproject.com/articles/365974/autocomplete-menu


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