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how to pass data between forms using delegates with vb.net

Posted on 2013-01-09
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Last Modified: 2013-01-09
I would like to know if how to read data from other form when Using a thread

this is my code:
        trd = New Thread(AddressOf analisis)
        trd.IsBackground = True
        trd.Start()

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sub analisis()
        Dim test As Double
        test  = cdbl(secondform.example.text)
end sub

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Give me this error I use the thread when test try to read the value from the textbox "example"
error
but I if remove the thread test obtain without problems the value from example

What I need to do to read the value of the the textbox example using the thread????
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Question by:altariamx2003
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CodeCruiser earned 500 total points
ID: 38761195
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Expert Comment

by:Mike Tomlinson
ID: 38761307
You can READ a controls value from another thread no problem.  I believe your error is because the value in the TextBox cannot be converted to a Double.  It is either blank or something that is not a number representing a Double.  Use Double.TryParse() instead...
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Author Comment

by:altariamx2003
ID: 38761479
thanks for answer Idle, but that was is not the problem

when I tried to assign the value of the textbox example inside the thread show me the error that I post

but outside the thread everything works great

I use the solution of Codecruiser


thanks anyway
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Author Closing Comment

by:altariamx2003
ID: 38761481
this is the solution

thanks!!!
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LVL 85

Expert Comment

by:Mike Tomlinson
ID: 38761657
The error you posted was indeed associated with the conversion of a string to a double, and had nothing to do with threading.  =)

The code you posted was reading from the control, which does not create an error.

Writing to the control from the thread, which you did not have in your posted code, would create a different exception that can be solved with Invoke() and Delegates.
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