master page control needs to acces in another webform not a child page

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C#

ASP.NET

Hello,

i have web application which as master page and child page.

i have one label on master page. i am able to access this label control in any child page like follow

child.aspx

<%@ MasterType VirtualPath="~/MasterPage/Site1.Master" %>

child.aspx.cs

((Label)this.Master.FindControl("lblsample")).Text = "Welcome ";

But, there is situation i should show master page content. so i created new webform called 'newlogin.aspx 'without master page which has head,body tag.

now if i try access master page control label in newlogin.aspx.cs, i am getting NULL reference exception.

newlogin.aspx

<%@ MasterType VirtualPath="~/MasterPage/Site1.Master" %>

newlogin.aspx.cs

((Label)this.Master.FindControl("lblsample")).Text = "Welcome ";

I am getting NULL reference exception as it is not finding.

how to access master page controls in this situation.