c# listbox problem

[Nikolee]

Solved solution for someone who may need it:

First mistake:

Create a constructor in your Class:

      private MainForm nMainForm;
 
  public myClassName(MainForm mainForm)
        {
            nMainForm = mainForm;
        }

/*Call it like this*/

public void urFunc()
{
nMainForm.listBox1.Items.Add("test");
}
 

But theres another thing u need to set up a constructor in the mainform for your Class:

 

 

 public urClassName myClass;
 
 //now initialize it in the mainform
 public MainForm()
 {
       myClass = new urClassName(this);
 }