Hi friends

I am working in vb.net ,there is i have a form in which i have a datagridview,& a column of checkbox in tat datagridview,when this datagridview becomes load, that checkes theb employee is present or absent if present so the check box of that perticular row must be checked true else checked false,for this i did

dim chk as checkbox

if condition that
chk.checked=true
else
chk.checked=false
end if
but it giving me a error message "object refrence not set"

please help me to solve this problem

Are you adding checkboxes to datagrid at runtime?
If not, then
"object reference not set"-error comes from declaring an object dim chk as checkbox but not creating the instance, like dim chk as New checkbox