I'm working on a C# program, and right now I have one `Form` and a couple of classes. I would like to be able to access some of the `Form` controls (such as a `TextBox`) from my class. When I try to change the text in the `TextBox` from my class I get the following error:

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> An object reference is required for the non-static field, method, or property 'Project.Form1.txtLog' 
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> 
> 

How can I access methods and controls that are in `Form1.cs` from one of my classes?