private void viewPostsButton_Click(object sender, System.EventArgs e) { if (blogsList.SelectedItems.Count == 0) { MessageBox.Show(this, "Select a blog first.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Information); return; } Blog selected = (Blog) blogsList.SelectedItems[0].Tag; using(PostManagement form = new PostManagement(selected)) { form.ShowDialog(this); } }