C# .NET - change Value in ArrayList in ArrayList

pls help me

                ArrayList arrContain = new ArrayList();
			
	ArrayList data = new ArrayList();

	data.Add("a");
	data.Add("b");
	data.Add("c");
	data.Add("d");
	arrContain.Add(data);
			
	data = new ArrayList();
	data.Add("aa");
	data.Add("bb");
	data.Add("cc");
	data.Add("dd");
	data.Add("ee");
	arrContain.Add(data);
			
	data = new ArrayList();
	data.Add("11");
	data.Add("22");
	data.Add("33");
	data.Add("44");
	data.Add("55");
	data.Add("66");
	arrContain.Add(data);

i want to change VALUE in array in array
for example i want to change "66" to "666",change "dd" to "dddd"
            
last time i use

foreach(ArrayList arrContain in arrContain)
{
	int size = arrTemp.Count;
	show = arrTemp[size-1].ToString();
	data = new ArrayList();
	count += "   "+arrContain.Count.ToString();
	//int index = arrContain.IndexOf(arrTemp.Count-1);
	//countaa += index+"  ";
				
	if(show=="66")
	{	
	         int index = arrTemp.IndexOf(show);
	
	         arrContain.RemoveAt(index);
	         arrContain.Insert(index,"666");
//2//	         arrContain[size-1] = "666"; 
                }

}
but it useless

help me pls

thank you very very much

Hi Nattachai,

You have to perform 2 loops to accomplish this.  Try this:

foreach (ArrayList arr1 in arrContain) {
foreach (string arrValue in arr1) {
if (arrValue == "66")
arrValue = "666";

if (arrValue == "dd")
arrValue = "ddd";
}
}

thank you,Ronald Francisco
but Cannot assign to 'arrValue' because it is read-only