ArrayList to String

Create the sample data:

ArrayList arrLst = new ArrayList();

string strCommaDelimited = "";

for(int x=0; x<5; x++)
{
   arrLst.Add(x);
}

Convert ArrayList to String Array:

string[] tmpStringArray = (string[])arrLst.ToArray(typeof(string));

Convert String Array created to String:

strCommaDelimited = String.Join(",", tmpStringArray);