How to rename an object?

[[Deleted]]

I have 7 trendlines available on chart

I want all of them to rename, 

I can get its name using ObjectName

but how can i rename it

[_MAHA_]

Arpit T:

I have 7 trendlines available on chart

I want all of them to rename, 

I can get its name using ObjectName

but how can i rename it

ObjectSetString, OBJPROP_NAME.