array conversions

using System;
using System.Collections.Generic;
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arraylist to array
> string[] a = (string[])arraylist.toarray(typeof(string));
> arraylist.copyto(array,0);
list to array
> string[] a = list.toarray();
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arraylist to arraylist
> arraylist.addrange(arraylist);
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array to arraylist
> arraylist.addrange(array);
> arraylist a = new arraylist(array);
array to list
> list<string> l = new list<string>(array)
> list<string> l = array.tolist();
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array to array
> string[]  a = (string[])array.clone();// Clone method creates a shallow copy of an array. A shallow copy of an Array copies only the elements of the Array
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array declaration and intilization methods
int[] a;
a = new int[3]{3,5,6};
int[] a = new int[]{3,4,5};
int[] a = new int[3]{3.4,5};
int[] a = new int[3];
a[0] = 2; a[1] = 3; a[2] = 4;
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search arraylist
arraylist.sort();
arraylist.binaryseach(43);
arraylist.indexof(searchstr , 0);
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string to bytearray
> byte[] = (new UnicodeEncoding()).GetBytes(stringToConvert);
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bytearray to string
>char[] cs = new char[bs.Length];
for (int i = 0; i < cs.Length; ++i)
{
cs[i] = Convert.ToChar(bs[i]);
}
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char array to string
string str = new string(chararray);

string to char array
string s = "hello";
char[] c = s.ToCharArray();
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array to datatable

>DataTable dataTable = new DataTable();dataTable.LoadDataRow(array, true);//Pass array object to LoadDataRow methodreturn dataTable;
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get array size
array.getlength(0).tostring();
array.getlowerbound(0).tostring();
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better to use List instead of ArrayList
better to use Dictionary instead of HashTable