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ASP.NET Using Master Pages



Master Page: Page with .master extension. Includes a complete web page structure. User <@Master> instead of <@Page> directive. Contains a ContentPlaceHolder.

ContentPage: .aspx file. Defines a ContentPlacHolder. Refers to its Master page in <@Page MasterPageFile = “mainPage.aspx”> directive.






To Attach Master Page at Page Level:


To attach Master Page to all page in web.config.
Only pages with <Content> controls.

One can also specify master page for each folder in web application by providing a different web.config for each folder.


Referencing Master page Properties, Methods and Controls from Content Page:

To do this Refer to the property or control of Master page in content page use<@MasterType> declaration.

<@ MasterType virtualpath = “~/MainTheme.master”>

In case of multiple base pages all master page should inherit from the a single base page. Then use that base Master Page as <@MasterType>.

To reference properties use:

Master.CompanName;


Referencing controls in Master Page:

Label companyName = (Label) Master.FindControl(“lblCompanyName”);

Handling Events when working with Master Pages:
The following is the sequence in which events occur when a master page is merged with a content page:
1.       Master page controls Init event.
2.       Content controls Init event.
3.       Master page Init event.
4.       Content page Init event.
5.       Content page Load event.
6.       Master page Load event.
7.       Content controls Load event.
8.       Content page PreRender event.
9.       Master page PreRender event.
10.     Master page controls PreRender event.
11.     Content controls PreRender event.


Creating Nested Master Pages:
          B master page inherits A master page. So, B’s Page directive will look like:

<@Master language = “C#” master = “A.Master” >
<asp:Content > to Cover A’s ContentPlaceHolder
<!--- Some Extra HTML -->

<asp:ContentPlaceHolder>
</asp:ContentPlaceHolder

</asp:Content>

Dynamically Changing the Master Page:

To dynamically alter the master Page one will have to override Page_PreInit().

Void Page_PreInit(Object sender, EventArgs e)
{        MasterPageFile = “MasterPage2.master”; }
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