Access master page control in content page using asp.net C#

Often developers need to access the controls of master pages for fulfill their requirement. Let me give you an example. 

Example:

We have a one Language dropdown in master page and we want to change the language of the matter inside the content page by changing Language dropdown.

Now let’s start

Open visual studio and go to File and click Web Site

Select ASP.NET web site and click OK

Go to Site.Master page file

In Site.Master page add the following code for dropdown.

<asp:Label ID="lblLanguage" runat="server" Text="SelectLanguage" ForeColor="White"></asp:Label>&nbsp;

<asp:DropDownList ID="ddlLanguages" runat="server" AutoPostBack="True" OnSelectedIndexChanged="ddlLanguages_SelectedIndexChanged" Width="100px">

<asp:ListItem Selected="True" Value="You select English">English</asp:ListItem>

<asp:ListItem Value="You select French">French</asp:ListItem>

</asp:DropDownList>

 

Inside your Site.Master.cs file create public property called Language.

public String Language

{

        get

        {

            return (String)ddlLanguages.SelectedValue;

        }

        set

        {

            ddlLanguages.SelectedValue = value;

        }

}

Set the property value inside the dropdown selected event changed.

protected void ddlLanguages_SelectedIndexChanged(object sender, EventArgs e)

{

        Language = ddlLanguages.SelectedValue;

}

Now go to Default.aspx page.

Now you can see the Default.aspx page.

Microsoft Visual Studio.net generates the default code for you; now remove the default code for simplicity. Just below the page directive add the following lines so that we are able to access the master page properties.

<%@ MasterType VirtualPath="~/Site.master" %>

 

Inside the content place holder add Label so that we can view result by using this label 

 

<br />

    <asp:Label ID="lblContent" runat="server"></asp:Label>

<br />

 

Now inside your Default.aspx.cs file write the following lines.

lblContent.Text = Master.Language;

Run the project and change the language dropdown and view the result. 

Now you can change this code according to your requirement.

That’s it.

Hope this help. :)