The two buttons allow use to move the selected item in the list up and down.
Write the code as shown below.
private void btnUp_Click(object sender, EventArgs e) { // Change the position by -1 example: Move from position 3 to position 2 MoveItem(-1); } private void btnDown_Click(object sender, EventArgs e) { // Change the position by 1 example: Move from position 2 to position 3 MoveItem(1); } public void MoveItem(int direction) { // Check if item can it be moved. Boolean ok = true; // Checking selected item if (lstData.SelectedItem == null || lstData.SelectedIndex < 0) ok = false; // No selected item - nothing to do // Calculate new index using move direction int newIndex = lstData.SelectedIndex + direction; // Checking bounds of the range if (newIndex < 0 || newIndex >= lstData.Items.Count) ok = false; // Index out of range - nothing to do if (ok) { // None of the errors above occured, move the item. object selected = lstData.SelectedItem; // Removing removable element lstData.Items.Remove(selected); // Insert it in new position lstData.Items.Insert(newIndex, selected); // Restore selection lstData.SetSelected(newIndex, true); changed = true; } }
To Do:Make sure everything works!
Experiment:When the form is resized, make hte list box fill the area.
Complete code for listbox editor
ListBox Manager in C#