Well you could store such information in Session, but I suggest storing such information in database.
for instance
protected void buttonDisable_Click(object sender, EventArgs e)
{
Session["DisableControls"] = true;
}
protected void buttonDisable_Click(object sender, EventArgs e)
{
Session["DisableControls"] = false;
}
and in other pages
protected void Page_Load(object sender, EventArgs e)
{
if(!this.IsPostBack)
{
buttonXYZ.Enabled = Session["DisableControls"] != null ? (bool)Session["DisableControls"] : true;
}
}
I'll repeat myself, I suggest you consider storing such information in DB.
Also read something about Role concept in software.