Button using action "set to" and evaluate expression

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I have a channel CB_Tank_X which I wish to update using the set to Action

if I use CB_Tank_X[0] in the expression it works

however if I use 


it does not

the above expression evaluates to CB_Tank_X[0] so I was assuming the data would update

What is the correct syntax to get this to work by using evaluate



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You cannot use evaluate() on the left side of an assignment (=).  In fact, you can't use any function on the left side of an =.  This is true in any programming language:

sin(3) = 4

does not make sense.  You can't assign the value 4 to the sin() of 3.

To do what you want, you have to use execute() and you have to do it from a quick sequence, since the Set To action just does a straight assignment.  The script would be something like:

private string datain = system.entryDialog("New value?")
if (!isempty(datain))
   execute(Sites[Site_ID[0]]+"_Tank_X = datain")



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