How to make rowspan based on condition in gridview

Question

I have have gridview like below 

 

 

 As per you see in the grid view There are many columns ,Like Indicator,Name,District,Year,UserTypes,Village,Active,Status,Quarter,Target,Achieved,Varience etc

 

I want to make ROWSPAN on Column (TARGET) based on the condition the condition is that where there is where there is same Year and Quarter like 2015 and Quarter01 so there is Target =75 multiple times i Want to make row span of all these rows (But just of this column Target and show a target once , all other columns should remain the same as below check this i want

Indicator	Name	Districts	Year	UserTypes	Villages	Active	Status	Quarter	TARGET	ACHIEVED	Varience
# of community members trained on child protection issues	shazia mussarat	Vehari	FY-2015	CDF	63-KBn	Yes	A	Quarter02	75	2	73
# of community members trained on child protection issues	shazia mussarat	Vehari	FY-2015	CDF	Jhedu	Yes	A	Quarter02	75	0	75
# of community members trained on child protection issues	shazia mussarat	Vehari	FY-2015	CDF	64-KB	yes	A	Quarter01	110	80	30
# of community members trained on child protection issues	shazia mussarat	Vehari	FY-2015	CDF	63-KB	Yes	P	Quarter01	110	18	92

 

Check above I have 75 Duplicated in first and second rows I want to marge the cell Quarter and make it one cell and place there 75 based on the condtion where year and Quarter are same in row , also in third row 110 and fourth row 110 on same year and quarter i want to merge this column target to one cell and show 110 there all others columns need to be same .The Condition is if year and quarter are same then merge the target column into one row and show target