disable usercontrol on the load of master page

<div class="ucTabCtrl" >
    <uc1:TLTabControl ID="ctrlname" runat="server" Visible="False" />
</div>

Master Page_load()
{
 // checking some condition if true
 ctrlname.visible = true;
}

public partial class Site1 : System.Web.UI.MasterPage
{
	protected void Page_Load(object sender, EventArgs e)
	{
		if (Page is WebForm1 || Page is WebForm2)
		{
			webUserControl11.Visible = false;
		}
	}
}

public partial class Site1 : System.Web.UI.MasterPage
{
	protected void Page_Load(object sender, EventArgs e)
	{
		ISpecialPage specialPage = Page as ISpecialPage;

		if (specialPage != null && specialPage.ShouldDisableUserControl)
			webUserControl11.Visible = false;
	}
}

public interface ISpecialPage
{
	bool ShouldDisableUserControl { get; }
}

if (null != this.Master)
{
    userControl.Enabled = false;
}

Dim userControl As WebControl = ContentPlaceHolder1.FindControl("someControl")
If userControl IsNot Nothing Then
   CType(userControl, WebControl).Enabled = False
End If