AppVeyorServices.ServerConfiguration.ConfigureAppVeyor._checkAll_Click C# (CSharp) Method

        private void _checkAll_Click(object sender, EventArgs e)
        {
            var allChecked = _projects.Nodes.Cast<ThreeStateTreeNode>().All(i => i.Checked);
            foreach (var node in _projects.Nodes.Cast<ThreeStateTreeNode>())
            {
                node.Checked = !allChecked;
            }
        }