public string prop //property

{

set { Label1.Text = value; } //write into property

}

<%@ Register Src="my.ascx" TagName="my" TagPrefix="uc1" %>

Protected void Page_Load(object sender, EventArgs e) 

{

if (!Page.IsPostBack) 

{

my uc = (my)Page.LoadControl("my.ascx" ); //loading the user control dynamically

uc.prop = "anoop"; //assign the label text a value

PlaceHolder1.Controls.Add(uc);

}