What does ContentPlaceHolderID mean?

html asp.net view contentplaceholder
user22707 picture user22707 · Jan 3, 2014 · Viewed 8.2k times · Source

In a LogOn view, I have the following code:

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

What does this fragment mean and where is "MainContent" defined?

EDIT

Thanks for your replies. I now understand how it works, but where is "MainContent" defined? Is it defined in the master page?

Answer

Guffa picture Guffa · Jan 3, 2014

That Content tag corresponds to a ContentPlaceHolder tag in the master page. It would have the id that the ContentPlaceHolderID property specifies, so it would look something like this:

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

The content of the Content tag will be inserted where ContentPlaceHolder tag is in the master page when the page is rendered.

Related questions

How to change the text of a label?

I have a radiobutton list and on click on the radio button item I have to change the text of its label. But for some reason it's not working. Code is below: <asp:Label ID="lblVessel" Text="Vessel:" runat="…

Read More
WebForms UnobtrusiveValidationMode requires a ScriptResourceMapping for 'jquery'. Please add a ScriptResourceMapping named jquery(case-sensitive)

I'm building a web application using Visual Studio 2012. I'm attempting to add word count into my textbox. However after adding the the javascript codes and the html codes. I receive the error as stated above. Here is my javascript codeds …

Read More
How to hide columns in HTML table?

I have created a table in ASPX. I want to hide one of the columns based on the requirement but there is no attribute like visible in the HTML table building. How can I solve my problem?

Read More