how to use ComboBox valuemembre in fonction ??

[Houssem TABET]

hello everyone

i make combobox link with a database , it's show list of item which one has a value this value used in fonction to calcul for exmple

list item value membre

Cr 0,04
H2O 0,13
H 0,0001
Br 0,034

J = 400 * 45 / (0.01 * " here i want to put the value " )

my problem that i want to show the list item for the user and when he selected item automatically he used the value membre

i used

J = 400 * 45 / (0.01 * combobox1.valuemembre ) didnt work

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J = 400 * 45 / (0.01 * combobox1.selectvalue ) didnt work

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dim N as double

N = combobox1.valuemembre

J = 400 * 45 / (0.01 * N ) didnt work

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