Using Server.Transfer

This is somewhat complex but sophisticated method of passing values  across pages. Here you expose the values you want to access in other  pages as  properties of the page class. This methods require you to code extra  properties that you can access in another web form. However, the efforts  are worth considering. Overall this method is much cleaner and object  oriented than earlier methods. The entire process works as follows:
Create the web form with controls 
Create property Get procedures that will return control values 
Provide some button or link button that posts the form back 
In the button click event handler call Server.Transfer method  that will
transfer execution to the specified form 
In the second form you can get a reference to the first form  instance by using
Context.Handler property. Then you will use the get  properties we created
to access the control values. 

The code to accomplish this is somewhat complex and is shown below:
Source Web Form
Add following properties to the web form:
public string Name
{
get
{
return TextBox1.Text;
}
}

public string EMail
{
get
{
return TextBox2.Text;
}
}
Now, call Server.Transfer.
private void Button1_Click
(object sender, System.EventArgs e)
{
Server.Transfer("anotherwebform.aspx");
}
Destination Web Form
private void Page_Load
(object sender, System.EventArgs e)
{
//create instance of source web form
WebForm1 wf1;
//get reference to current handler instance
wf1=(WebForm1)Context.Handler;
Label1.Text=wf1.Name;
Label2.Text=wf1.EMail;
}