Question

I have a ContextMenu assigned to two ListViews. How to know which ListView it was used with so I can apply correct method? I guess sender is important here but how do I use it? How to know what sender is at this very moment?

private void contextMenuDokumentyDodaj_Click(object sender, EventArgs e) {
    var dokumenty = new DocumentsGui(varKlienciID, varPortfelID);
    dokumenty.Show();
    dokumenty.FormClosed += varDocumentsGui_FormClosed;
}

Answer 1

ContextMenu.SourceControl

is your ticket.

http://msdn.microsoft.com/en-us/library/system.windows.forms.contextmenu.sourcecontrol.aspx

EDIT

ContextMenuStrip, you say?

http://msdn.microsoft.com/en-us/library/system.windows.forms.contextmenustrip.sourcecontrol.aspx