1)Page level caching(PageOutput caching)
2)Page Fragment caching(Partial pageOutput caching)
3)Programmatic caching(Data Caching)

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At page directive

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajaxToolkit" %>

Controls needed at designing page

<asp:TextBox runat="server" ID="myTextBox" Width="300" autocomplete="off" />
<ajaxToolkit:AutoCompleteExtender runat="server" ID="autoComplete1" TargetControlID="myTextBox"
ServicePath="myWebService.asmx" ServiceMethod="GetDestinationNames" MinimumPrefixLength="1"
CompletionInterval="1000" EnableCaching="true" CompletionSetCount="12" />

Add a Web Service and add code to get your required data
public string[] GetDestinationNames(string prefixText, int count)
{
string Query = "SELECT * From YourTable where column like '%" + prefixText + "%'";
OdbcDataAdapter da = new OdbcDataAdapter(new OdbcCommand(Query, con));

DataSet ds = new DataSet();
da.Fill(ds);

string[] strArr = new string[ds.Tables[0].Rows.Count];
for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
{
strArr[i] = ds.Tables[0].Rows[i]["city_name"].ToString();
}
return strArr;
}

Finally you can get fully working auto suggest textbox.

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_doPostBack('Control id','');

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RootNamespace property

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XL C/C++ uses the American National Standard Code for Information Interchange (ASCII) character set.
The following table lists the standard ASCII characters in ascending numerical order, with their corresponding decimal, octal, and hexadecimal values. It also shows the control characters with Ctrl- notation. For example, the carriage return (ASCII symbol CR) appears as Ctrl-M, which you enter by simultaneously pressing the Ctrl key and the M key.

Decimal Value	Octal Value	Hex Value	Control Character	ASCII Symbol	Meaning
0	0	00	Ctrl-@	NUL	null
1	1	01	Ctrl-A	SOH	start of heading
2	2	02	Ctrl-B	STX	start of text
3	3	03	Ctrl-C	ETX	end of text
4	4	04	Ctrl-D	EOT	end of transmission
5	5	05	Ctrl-E	ENQ	enquiry
6	6	06	Ctrl-F	ACK	acknowledge
7	7	07	Ctrl-G	BEL	bell
8	10	08	Ctrl-H	BS	backspace
9	11	09	Ctrl-I	HT	horizontal tab
10	12	0A	Ctrl-J	LF	new line
11	13	0B	Ctrl-K	VT	vertical tab
12	14	OC	Ctrl-L	FF	form feed
13	15	0D	Ctrl-M	CR	carriage return
14	16	0E	Ctrl-N	SO	shift out
15	17	0F	Ctrl-O	SI	shift in
16	20	10	Ctrl-P	DLE	data link escape
17	21	11	Ctrl-Q	DC1	device control 1
18	22	12	Ctrl-R	DC2	device control 2
19	23	13	Ctrl-S	DC3	device control 3
20	24	14	Ctrl-T	DC4	device control 4
21	25	15	Ctrl-U	NAK	negative acknowledge
22	26	16	Ctrl-V	SYN	synchronous idle
23	27	17	Ctrl-W	ETB	end of transmission block
24	30	18	Ctrl-X	CAN	cancel
25	31	19	Ctrl-Y	EM	end of medium
26	32	1A	Ctrl-Z	SUB	substitute
27	33	1B	Ctrl-[	ESC	escape
28	34	1C	Ctrl-\	FS	file separator
29	35	1D	Ctrl-]	GS	group separator
30	36	1E	Ctrl-^	RS	record separator
31	37	1F	Ctrl-_	US	unit separator
32	40	20		SP	digit select
33	41	21		!	exclamation point
34	42	22		"	double quotation mark
35	43	23		#	pound sign, number sign
36	44	24		$	dollar sign
37	45	25		%	percent sign
38	46	26		&	ampersand
39	47	27		'	apostrophe
40	50	28		(	left parenthesis
41	51	29		)	right parenthesis
42	52	2A		*	asterisk
43	53	2B		+	addition sign
44	54	2C		,	comma
45	55	2D		-	subtraction sign
46	56	2E		.	period
47	57	2F		/	right slash
48	60	30		0
49	61	31		1
50	62	32		2
51	63	33		3
52	64	34		4
53	65	35		5
54	66	36		6
55	67	37		7
56	70	38		8
57	71	39		9
58	72	3A		:	colon
59	73	3B		;	semicolon
60	74	3C		<	less than
61	75	3D		=	equal
62	76	3E		>	greater than
63	77	3F		?	question mark
64	100	40		@	at sign
65	101	41		A
66	102	42		B
67	103	43		C
68	104	44		D
69	105	45		E
70	106	46		F
71	107	47		G
72	110	48		H
73	111	49		I
74	112	4A		J
75	113	4B		K
76	114	4C		L
77	115	4D		M
78	116	4E		N
79	117	4F		O
80	120	50		P
81	121	51		Q
82	122	52		R
83	123	53		S
84	124	54		T
85	125	55		U
86	126	56		V
87	127	57		W
88	130	58		X
89	131	59		Y
90	132	5A		Z
91	133	5B		[	left bracket
92	134	5C		\	left slash, backslash
93	135	5D		]	right bracket
94	136	5E		^	hat, circumflex, caret
95	137	5F		_	underscore
96	140	60		`	grave accent
97	141	61		a
98	142	62		b
99	143	63		c
100	144	64		d
101	145	65		e
102	146	66		f
103	147	67		g
104	150	68		h
105	151	69		i
106	152	6A		j
107	153	6B		k
108	154	6C		l
109	155	6D		m
110	156	6E		n
111	157	6F		o
112	160	70		p
113	161	71		q
114	162	72		r
115	163	73		s
116	164	74		t
117	165	75		u
118	166	76		v
119	167	77		w
120	170	78		x
121	171	79		y
122	172	7A		z
123	173	7B		{	left brace
124	174	7C		|	logical or, vertical bar
125	175	7D		}	right brace
126	176	7E		~	similar, tilde
127	177	7F		DEL	delete

ASCII code

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