Access Master Pages Properties
There are different techniques to access MasterPages properties Master Page Code file: public partial class MyMasterPageClass: System.Web.UI.MasterPage { public string ErrorMessage { set { lblErrorPane.Text = value; panelErrorMessage.Visible = true; } } } Content Page 1) (( MyMasterPageClass )Master).ErrorMessage = " Test Error Message"; After adding this <%@ MasterType VirtualPath="~/MasterPage.master" %> under Page Directive you can access the property of master page directly. 2) this.Master.ErrorMessage = "Test Message";