decimal format in datalist c#

string.Format()
formatting numbers
Number formatting is culture dependant. For example, formatting a currency string on my laptop will return a result like £9.99, formatting a currency on a machine set for the US region would return $9.99.

specifier	type	format	output (double 1.2345)	output (int -12345)
c	currency	{0:c}	£1.23	-£12,345.00
d	decimal (whole number)	{0:d}	System.FormatException	-12345
e	exponent / scientific	{0:e}	1.234500e+000	-1.234500e+004
f	fixed point	{0:f}	1.23	-12345.00
g	general	{0:g}	1.2345	-12345
n	number	{0:n}	1.23	-12,345.00
r	round trippable	{0:r}	1.23	System.FormatException
x	hexadecimal	{0:x4}	System.FormatException	ffffcfc7

more info see this link

<%# Eval("Price", "{0:C}") %>

String in double format