Question

I have a small issue with DataGridView.

I have two forms, in one form the data will be populated by the DataGridView.

When we click on the column header of the gridview the other form will be opened with the corresponding column values.

I have done some manipulations on the data in form2 so before closing form2 I want to update the form1 gridview with these details…

I have seen some details like eventhandler attachment in form1, but I didn’t find an exact answer.

Answer 1

Form 2 code

    public event EventHandler<UpdatedEventArgs> updateEvent;

    public class UpdatedEventArgs : EventArgs
    {
        public string SomeVal { get; set; } // create custom event arg for your need
    }

    protected virtual void OnFirstUpdateEvent(UpdatedEventArgs e)
    {
        if (updateEvent != null)
            updateEvent(this, e);
    }


    private void button1_Click(object sender, EventArgs e)
    {
        UpdatedEventArgs eventData = new UpdatedEventArgs(); 
        eventData.SomeVal = "test"; // set update event arguments, according to your need

        OnFirstUpdateEvent(eventData);
    }

    public Form2()
    {
        InitializeComponent();
    }

Form 1 code

    public Form1()
    {
        InitializeComponent();

        Form2 form2 = new Form2();
        form2.updateEvent += new EventHandler<Form2.UpdatedEventArgs>(form2_updateEvent); // create event handler to update form 1 from form 2
        form2.Show();
    }

    void form2_updateEvent(object sender, Form2.UpdatedEventArgs e)
    {
        if (e != null && e.SomeVal != null)
        {
            // Do the update on Form 1 
            // depend on your event arguments update the grid  
            //MessageBox.Show(e.SomeVal); 
        }

    }