Refresh the control or reload form from button click event handler on other form

Question

I have a GridView in Liste_Form and button in Close_Form.

How can I refresh the Gridview in Liste_Form, when i click the button on Close_Form?

Or reload the Liste_Form.

Answer 1

You have a few ways this can be done. One way I might suggest is passing a delegate to the second form in the constructor:

Form2 myForm2 = new Form2(RefreshGrid); // assign to a Form2 local variable

...where in Form1 (the grid owner) you have defined the RefreshGrid method:

void RefreshGrid(){
   // perform grid refresh
}

...so that in myForm2 you can execute the action when the button is clicked:

void OnButtonClicked(object sender, EventArgs e){
   refreshAction();
}

Answer 2

Define event on Close_Form (of course consider better name for event):

public event EventHandler SomethingHappened; 

Raise this event inside button click event handler:

private void Button_Click(object sender, EventArgs e)
{
    if (SomethingHappened != null)
        SomethingHappened(this, EventArgs.Empty);
}

Subscribe to this event on Liste_Form:

Close_Form closeForm = new Close_Form();
closeForm.SomethingHappened += Close_Form_SomethingHappened;

Refresh your list in this event handler:

private void Close_Form_SomethingHappened(object sender, EventArgs e)
{
    // refresh GridView
}