c# - How to pass on demand data to datagrid virtualization -

i'm using data grid create 1 comparison window.the rows in data grid

clm1 clm2 clm3 clm4 ...

all decided in runtime. also, there 2d , 3d image histogram profile , number of clmns/rows dynamic...

since there can hundreds/thousands of rows , indefinite clms using datagrid virtualization;.

now design when window launched may 200 rows of data populated data grid @ 1 go (each row memory can of 50/100 mb each based on clms) --- plan keep data’s in cache file, , load when particular row comes view in data grid.

so doubt how identify row in view can ask specific data cache file.