Renaming column name in excel after populating data from gridview

I have a dashboard which is a gridview. I've a button to expor开发者_运维问答t the gridview data to excel which is already working fine. The only problem is that the column names are not user friendly and I want to change it while populating the data from the gridview.

The column name of the gridview is not coming to the excel at all. It's just reading the column names as which is there in the datatable.

please help.

Thanks in advance, ThunderRock