Event used to check an empty text box is searching

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
event used to check an empty text box is	`1.95`	`0.2`	`1412`	39	41
event	`1.45`	`0.8`	`5389`	6	5
used	`0.02`	`0.1`	`685`	13	4
to	`1.72`	`0.9`	`3785`	79	2
check	`0.74`	`0.7`	`1150`	32	5
an	`1.41`	`0.9`	`4595`	26	2
empty	`0.57`	`0.6`	`5124`	84	5
text	`1.89`	`0.3`	`4537`	48	4
box	`0.82`	`0.8`	`2716`	77	3
is	`0.52`	`0.4`	`5233`	46	2

Keyword	CPC	PCC	Volume	Score
check if textbox is empty	1.28	0.7	7105	74
vb.net check if textbox is empty	1.71	0.2	4267	55
empty check box symbol	1.56	0.7	6226	92
el-checkbox $event	0.87	0.9	5860	29
checkbox $event	0.82	0.9	9949	27
vba check if textbox is empty	1.71	0.7	7716	33
check if textbox is empty javascript	1.16	0.9	8153	55
if textbox is empty vba	1.24	0.8	9737	4
excel vba if textbox is empty	1.1	0.5	7913	61
check empty textbox in javascript	0.57	0.9	9618	93
check if textbox is empty jquery	0.87	0.3	7824	80
vb.net check if array is empty	1.87	0.4	7270	17
vb.net check textbox is number	1.12	0.2	5490	13
vbscript check if string is empty	0.08	0.9	3889	8
vb.net check if picturebox is empty	0.34	0.1	4125	79
vb.net check if directory is empty	1.09	0.6	6449	41
vb.net checkbox text	1.39	0.9	6663	34
c# check if string is empty	1.33	0.7	2549	75
vb.net check for null or empty string	0.85	0.1	7177	70
c# check if object is empty	1.01	0.6	8906	97
vba check if empty	1.55	0.4	3531	38
vbscript check empty string	0.41	0.7	5546	94
check box in vb.net	0.51	1	963	66