c# - Visual Studio Lightswitch 2013 HTML... how to calcualte and display? -

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its rather simple area really, ive got lightswitch application hooked sql server, , want add 3 values table using computed field... know c# code side here work im add, ive got value in table, how display on screen view?

it doesnt show in table list dragged , dropped onto screen, started javascript few days ago inexperienced @ moment, if possible, point me in right direction or give example of javascript please, grateful... thanks. literally spent days trying things , got no where..


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