Object Reference Error

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I keep receiving an error of:

Error 2 An object reference is required for the non-static field, method, or property 'System.ComponentModel.BackgroundWorker.ReportProgress(int)'

and

Error 1 An object reference is required for the non-static field, method, or property 'System.ComponentModel.BackgroundWorker.RunWorkerAsync(object)

But all I did was copy and paste from another project? The other project it works just fin, why is it causing problems in a new project?

Is was for a background worker progress example: Displaying progress updates when hashing large files

Posted 21-May-15 9:10am

Herboren

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Sergey Alexandrovich Kryukov 21-May-15 16:52pm

Why so many our inquirers think that programming (or learning programming) is done by copy and paste? Did you try to actually write code understanding all you are doing (and not doing what you don't understand)? Perhaps than you would not have such problems.
—SA

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Sascha Lefèvre · Accepted Answer · 2015-05-21T09:24:00

Solution 1

In the project you downloaded open the Form in the Forms-Designer: The author dropped a BackgroundWorker from the Toolbox (from the Components-section) onto the form and named it "BackgroundWorker" (the exact name of the class).

If you have not done the same or named your BackgroundWorker-variable differently then the compiler interpretes the identifier "BackgroundWorker" as the class name and not as a variable of the type BackgroundWorker.

So: Either have a variable named "BackgroundWorker" or replace the identifier "BackgroundWorker" by the name of your existing variable.

Posted 21-May-15 9:24am

Sascha Lefèvre

Comments

Herboren 21-May-15 15:30pm

Wow thank you soo much, I can't believe I didn't see this. I never knew there was a control for this. This cleared it right up, thank you so very much!

Sascha Lefèvre 21-May-15 15:42pm

You're welcome! :)

Sergey Alexandrovich Kryukov 21-May-15 16:55pm

5ed, but... The root of the problem is the way the inquirer tries to learn things. But it's good that he probably understood your answer; I did not expect that.
Please see my comment to the question.
Still, I'm not sure the essence of things (in this case, static vs instance members and using those instance members) is really clear to him.
—SA

Sascha Lefèvre 21-May-15 17:08pm

Thank you, Sergey.
The OP is welcome to ask a follow-up question if there's any confusion left :)
(As I have found out from the question I posted recently, the OP receives any comments to an answer.)
/Sascha

Herboren 21-May-15 16:57pm

Solutions was already given. Should just leave it at that. =\