help with C# Arraylist Itemlist.add to display in a listbox using for loop for sorted and foreach for reverse order?

I think generic list is easy to use for this purpose as shown below

void Main()
{
	Form form1 = new Form();
	ListBox listBox1 = new ListBox();
	listBox1.Dock= DockStyle.Fill;
	form1.Controls.Add(listBox1);
	
	List<string> items = new List<string>{"Item5","Item2","Item4","Item1","Item3"};
	//Option1
	items.Sort((s1,s2)=>s2.CompareTo(s1));
	//Option2
//	items.Sort();
//	items.Reverse();
	
	listBox1.DataSource=items;
	form1.ShowDialog();
	
}

First of all I would use the generic List<string> instead of non-generic Array. Unless you are going to be using the list for something besides string, you will speed things up by using generic and gives you more flexibility. Sorting can then be done with the List sort capability:

Array.Sort(delegate(string s1, string s2) 
    { 
      return s2.CompareTo(s1); 
    });

Solution 2 is correct in that you can do a Sort and Reverse, but that is an ArrayList or List<t></t> class, and you would be limited to the standard sort \. There is a Array.Reverse (ArrayList) that you can use (the sort is also a static method).

Try a countdown loop

for (i = 4; i =0; i--)
{
}

well all i try a differnt way seems like it was gna work but got stop error hear code any help i would be greatful

public partial class form1 : Form
{
public string[] StringArray { get; set; }
protected int counter = 0;
public form1()
{
InitializeComponent();
}


private void form1_Load(object sender, EventArgs e)
{
//seting array
TextBox item1 = sender as TextBox;
string str = item1.Text;
if (item1.Text != "")
item1.Enabled = false;
StringArray[counter] = item1.Text;
counter++;
TextBox item2 = sender as TextBox;

if (item2.Text != "")
item2.Enabled = false;
StringArray[counter] = item2.Text;
counter++;


TextBox item3 = sender as TextBox;

if (item3.Text != "")
item3.Enabled = false;
StringArray[counter] = item3.Text;
counter++;

TextBox item4 = sender as TextBox;

if (item4.Text != "")
item4.Enabled = false;
StringArray[counter] = item4.Text;
counter++;

TextBox item5 = sender as TextBox;

if (item5.Text != "")
item5.Enabled = false;
StringArray[counter] = item5.Text;
counter++;


}



private void displaybtn_Click(object sender, EventArgs e)
{

//sort of list
StringBuilder StrArrsort = new StringBuilder();
StringBuilder StrArrRev = new StringBuilder();

foreach (string str in StringArray) /// stop error {"Object reference not set to an instance of an object."}
{
StrArrsort.Append(str);
}
//rev of list
for (int i = StringArray.Length - 1; i >= 0; i--)
{
StrArrRev.Append(StringArray[i]);
}
// show list in lables
lilsorted.Text = StrArrsort.ToString();
lilrevers.Text = StrArrRev.ToString();
}

private void clearbtn_Click(object sender, EventArgs e)
{
item1.Text = ("");
item2.Text = ("");
item3.Text = ("");
item4.Text = ("");
item5.Text = ("");
lilsorted.Text = ("");
lilrevers.Text = ("");
}

private void exitbtn_Click(object sender, EventArgs e)
{
this.Close();
}



}
}