Access control in Master Page from Child Content Page in ASP.Net using C# and VB.Net

Hi SSK,

After succefully login you need to find the Label control that is in the master page and assign the Text property to change the text like below.

// After succefully login
Label status = this.Master.FindControl("lblstatus") as Label;
status.Text = "Logout";

Check this example. Now please take its reference and correct your code.

HTML

MasterPage.master

Master Page Content
<hr />
<a href="Login.aspx"><i class="fa fa-user"></i>
    <asp:Label ID="lblstatus" runat="server" Text="Login"></asp:Label></a>
<hr />
<div>
    <br />
    Child Page Content
    <br />
    <hr />
    <asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server">
    </asp:ContentPlaceHolder>
</div>

Login.aspx

<%@ Page Title="" Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true"
    CodeFile="Login.aspx.cs" Inherits="Login" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="Server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">
    Login Page
</asp:Content>

Code

Login.aspx.cs

protected void Page_Load(object sender, EventArgs e)
{
    // After Successsfully login write the below code
    Label status = this.Master.FindControl("lblstatus") as Label;
    status.Text = "Logout";
}

Login.aspx.vb

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    ' After Successsfully login write the below code
    Dim status As Label = TryCast(Me.Master.FindControl("lblstatus"), Label)
    status.Text = "Logout"
End Sub

Screenshot