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I'm trying to call a non-static method (LoadingListBox) in my class (ListDisplay) from a button click event in my AddTask class.

namespace Project
{
    public partial class ListDisplay : Form
    {

        public  void LoadingListBox()
        {
            //code
        }
    }
 }

namespace Project
{
    public partial class AddTask : Form
    {
         private void btnSubmit_Click(object sender, EventArgs e)
         {
             //code
             //I want to call LoadingListBox here
         }
    }
}

I have tried creating an instance of ListDisplay by doing ListDisplay listDisplayI = new ListDisplay(); and then writing ListDisplay.LoadingListBox();

There were no errors with this code but when debugging the flow of control wouldn't go to the method it just carried on past it. I have also tried doing what the answer suggests from this question:

Call a public method of main class from another class

But that comes up with an error as I can't overload the btnSubmit_Click method as the Designer freaked out. So I created a new method that had all of the code of btnSubmit_Click called public static void addingTask(ListDisplay) but I then had to create an instance of ListDisplay in order to put it as an argument in the btnSubmit_Click method hence ending up with two instances which is not what I want (due to answer of question).

So now I have come up with nothing and would appreciate any help you could give in order to call this LoadingListBox method. Thanks!

share|improve this question

1 Answer 1

up vote 0 down vote accepted

Your two choices are based on whether or not you want a new instance of ListDisplay when you click the button or not.

Option 1:

namespace Project
{
    public partial class AddTask : Form
    {
        private void btnSubmit_Click(object sender, EventArgs e)
        {
            var ld = new ListDisplay();
            ld.Show();
            ld.LoadingListBox();
        }
    }
}

Option 2:

namespace Project
{
    public partial class AddTask : Form
    {
        private ListDisplay _ld;
        public AddTask(ListDisplay ld)
        {
            _ld = ld;
        }

        private void btnSubmit_Click(object sender, EventArgs e)
        {
            _ld.LoadingListBox();
        }
    }
}
share|improve this answer
    
Thanks for answering, with option 2 how would I call AddTask as I've tried putting AddTask AddTaskI = new AddTask(this); and AddTask AddTaskI = new AddTask(ListDisplay); and they haven't worked? – Emma D Apr 12 at 0:51
    
@EmmaD - What is this in the new AddTask(this)? Is it an instance of ListDisplay? Also, on SO, please never say "they haven't worked" without explaining what went wrong. – Enigmativity Apr 12 at 1:40
    
Don't worry I must have typed it wrong before as using new AddTask(this) now works! this being the instance of ListDisplay as I am calling it from the ListDisplay form. – Emma D Apr 12 at 1:48

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