ListBox Manager in C#
Delete
In order to make changes we will add the code for mnuDelete, mnuAdd, and mnuEdit.
Add and Edit use the list box form.
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Write the code for mnuDelete and mnuSaveAs as shown below.
private void mnuDelete_Click(object sender, EventArgs e)
{
// Remove the selected item from the list box.
lstData.Items.Remove(lstData.SelectedItem);
changed = true;
}
private void mnuAdd_Click(object sender, EventArgs e)
{
// Display the input box form to let the user type in a new item.
InputBox box = new InputBox();
box.ShowDialog();
TextBox txt = box.getTextBox();
// This gives us accfess to the text box on the form.
if (txt.Text != "")
{
// If a new item was typed, add it to list box.
lstData.Items.Add(txt.Text);
changed = true;
}
}
private void mnuEdit_Click(object sender, EventArgs e)
{
// Display the input box form to let the user edit the current item.
InputBox box = new InputBox();
TextBox txt = box.getTextBox();
// Put the current item into the text box to edit.
txt.Text = lstData.Text;
box.ShowDialog();
// Save the current index of list box, so that old item
// can be deleted and new item inserted in the same position.
int pos = lstData.SelectedIndex;
lstData.Items.Remove(lstData.SelectedItem);
// If they changed the text to "", assume it is to be deleted.
if (txt.Text != "") lstData.Items.Insert(pos, txt.Text);
changed = true;
}
To Do: Make sure this works before proceeding.
That's all! Congratulations on completing all of the lessons in csharp!