Visible and style. display are different.

Visible: Specifies whether the control is generated and sent to the client for display. If it is set to false, the control is not generated on the interface; Therefore, if you want to access the HTML representation of the control using the ID on the client (backend) (for example, button. Click, gridviewrow. Cell [Index]. Text), you cannot obtain it.
If a server-side control is used and the HTML representation of the control needs to be displayed and hidden on the client, you must set the display and hidden attributes in the background when adding the control:
Control ID. Attributes. Add ("style", "display: Value "); Or this. Control ID. style. Remove ("display "); This. Control ID. style. Remove ("display ","");
In this way, you can use the HTML representation of this control on the client.