masterpage

Hi Here is Your Solution !

Suppose you want to change Text Of Label1 on Masterpage then you can change it from child Page Like below Code

ChildPage.aspx
------------------

  protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            ((Label)Master.FindControl("Label1")).Text = "Hello World";
        }
    }

for getting Text of label 1

       //Get Label Text of Label1 in Child Page from master page
        string textOnLabel = ((Label)Master.FindControl("Label1")).Text;
        Response.Write(textOnLabel);