How to Read Access Get Set Master Page Controls from Child Page using Asp.Net C#

In this Article, i will explain how we can access or read Master page controls from Child Page or Content Page.

First Add some controls in Master Page to read from Child Page:

<div class="main">

      <asp:Label ID="lblMaster" runat="server" Text="Master Label"></asp:Label>

      <asp:TextBox ID="txtMaster" runat="server"  placeholder="Master Textbox" ></asp:TextBox>

      <asp:ContentPlaceHolder ID="MainContent" runat="server" />

    </div>

Add some Controls in Child Page:

<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="Server">

  <br />

  <hr />

  <asp:Button ID="btnGetMasterPageContent" runat="server" Text="Get Master Page Content" OnClick="btnGetMasterPageContent_Click" />

  <asp:Button ID="btnSetMasterPageContent" runat="server" Text="Set Master Page Content" OnClick="btnSetMasterPageContent_Click" />

  <br /><br />

  <asp:Label ID="lblChild" runat="server" Text="Child Label"></asp:Label>

  <asp:TextBox ID="txtChild" placeholder="Child Textbox" runat="server"></asp:TextBox>

</asp:Content>

Now Child Page Code behind:

protected void btnGetMasterPageContent_Click(object sender, EventArgs e)

    {

      Label lblMaster = (Label)Master.FindControl("lblMaster");

      TextBox txtMaster = (TextBox)Master.FindControl("txtMaster");

      if (lblMaster != null)

      {

        lblChild.Text = lblMaster.Text;

      }

      if (txtMaster != null)

      {

        txtChild.Text = txtMaster.Text;

      }

    }

    protected void btnSetMasterPageContent_Click(object sender, EventArgs e)

    {

      Label lblMaster = (Label)Master.FindControl("lblMaster");

      TextBox txtMaster = (TextBox)Master.FindControl("txtMaster");

      if (lblMaster != null)

        lblMaster.Text = lblChild.Text;

      if (txtMaster != null)

        txtMaster.Text = txtChild.Text;

    }

Note-Hope now you can Access Master Page Contents as well as can set also data from child page.

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