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Expression between datatable values using C#

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Hi , i want to declare mathematical expression between values from datatable , for example: i have two columns named 'Variable'(string) and 'Contents' (float) , i have inserted in 'Variables' 3 string a , b and c and in 'Contents' 3 floats are 0, 3 and 6 .Now i want to declare 'a=b+c' in code an when i click on a 'button' the variable a will change in datatable to 9. here is my code but it doesn't work!! help me please !
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