When i invoke the multicast delegate i'm getting null reference error. I know that some where the object is getting reset to null.

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ASP

.NET

I have used 3 webforms
webform1 contains multicast delegate
webfomr2 contains method Callme()and a label Control
webform3 also contains the same as webform2.
Now when i invoke the multicast delegate i'm getting null reference error. I know that some where the object is getting reset to null.
But why its getting reset to null ?

Code behind file
Webform1.cs
----------------

namespace MultiCasteExample
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        public delegate void CallEveryOne();
        public void method1()
        {                           
                CallEveryOne objcall = null;
                
                
               WebForm2 obj1 = new WebForm2();
               WebForm3 obj2 = new WebForm3();
                objcall += obj1.CallMe;
                objcall += obj2.CallMe;
                objcall.Invoke();
        }
       
        protected void Page_Load(object sender, EventArgs e)
        {
            method1();
             
        }
    }
}

WebForm2.cs
-----------------

namespace MultiCasteExample
{
    public partial class WebForm2 : System.Web.UI.Page
    {
        public void CallMe()
        {           
            Label1.Text = "ErrorMessage BroadCasted at " + DateTime.Now.ToString();
        }
        protected void Page_Load(object sender, EventArgs e)
        {
        }
    }
}

WebForm3.cs
--------------

namespace MultiCasteExample
{
    public partial class WebForm3 : System.Web.UI.Page
    {
        public void CallMe()
        {
            Label1.Text = "Error Message is broadcasted at" + DateTime.Now.ToString();
        }
        protected void Page_Load(object sender, EventArgs e)
        {
        }
    }
}