C#

treeView2.Nodes.Clear();
foreach(TreeNode node in treeView1.Nodes){
    treeView2.Nodes.Add(node);
}

AngryC wrote:

You must first remove it from its current location or clone it.

foreach (TreeNode tn in treeView1.Nodes) {
    treeView2.Nodes.Add(tn.Clone() as TreeNode);
}

Color c = Color.FromArgb(r, g, b);

BoneSoft wrote:

Color is a struct and therefore mutable,

BoneSoft wrote:

And my understanding was that all structs are immutable, trying to change them just creates and swaps a new one behind the scenes, like strings or any other stacked value

Point pt = new Point(1,1);
pt.X = 2;

private void checkBox_CheckedChanged(object sender, EventArgs e) {
    if(sender is CheckBox){
        if(((CheckBox)sender).Checked){
            foreach(CheckBox ck in list){
                if(ck != sender){ //Object comparison
                    ck.Checked = false;
                }
            }
        }
    }
}

StreamReader s = new StreamReader(@"f:\mytext.txt");

ArrayList a = new ArrayList();
while (s.Peek() >= 0)
{
    string alltext = "";
    string text = "";
    while ((text = s.ReadLine()) != "" && text != null)
    {
         alltext += ("|" + text);
    }
    a.Add(alltext);
}

s.Close();

foreach (string text in a)
{
    string[] splitString = text.Split('|');

    string tempstring = "";
    for (int i = 3; i < splitString.Length; i++)
    {
         tempstring += splitString[i];
    }

ListViewItem lvi = new ListViewItem(new string[] { splitString[1], splitString[2].Substring(0, 12), splitString[2].Substring(17, 12), tempstring });
this.listView1.Items.Add(lvi); 
}