gridview - In grid view control I am trying to collect of "user request no" in 1st column -

in grid view control, trying collect of user request no in 1st column don't want show column when set visible=false , collects null value.

suggest code capture data invisible column in grid view control.

grid view control fill data sql data source.

it web form.

it web form grid view control

in below table don't want show laundry id when customer selects row want hold id in session. when column visible work when set property visible=false doesn't work , holds null value.

i set property visible = false