Hide Controls using browser scripts

How to hide controls using browser scripts.

If the requirement says that particular button control should be disabled while doing a query or any other event like save,delete etc

write the following script on pre invoke event where Method name = Query/Save/Delete

var controlVar = this.FindControl("Control  Name");
controlVar.SetProperty("Visible", "false");

Or if the requirement says  the control should be enabled at particular event.
Write the following script on pre invoke event for method = Execute Query

var controlVar = this.FindControl("ControlName");
controlVar.SetProperty("Visible", "true");



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