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Thursday, 31 December 2015

Which page is called first in asp.net c#? Web form or Master page?


Today in Engineer's World, we are discussing a C# query faced by a developer in very easy way. Posted By- +Manish Kumar Gautam +LIVE VIAR +ASP.NET SOLUTIONS 

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Which page is called first in asp.net c#? Web form or Master page?

One such scenario is - Suppose you have a master page and a nested web form page. In your master page, you write some piece of code. Like, you add a label control and write its Text property as “Master Page Load” with Red color.
Note: We haven’t written any code in the code-behind for any page (neither in master nor in web form page).

Code that we write on the master page.

Practical Implementation:

<body>
    <form id="form1" runat="server">
        <div>
            <asp:Label ID="Label1" runat="server" Text="Master Page Load" ForeColor="Red"></asp:Label>
            <br />
            <asp:ContentPlaceHolder id="ContentPlaceHolder1" runat="server">

            </asp:ContentPlaceHolder>
        </div>
    </form>
</body>
</html>

In the same manner, you add a label control and write its Text property as “Content Page Load” with Red color. 

Code that we write on web form page

Practical Implementation:

<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
    <asp:Label ID="Label1" runat="server" Text="Content Page Load" ForeColor="Red"></asp:Label>
    <br />
</asp:Content>

Now, the question arises
Which page label control is called first? Is it the Default.aspx or MasterPage.master?
Let’s run and check.



Output:

We got the output as master page label called first and content page label called after master page.
Reason explanation: We have taken server control. And server control renders. And as per the event sequence of pages – Web Form page control load after Master Page control. That’s why Master Page Control Render first than Content Page.


Related Questions:


Q-1 Which of the following is an ordered collection class?
1) Map
2) Stack
3) Queue
4) BitArray
5) HashTable

(A) 1 only
(B) All the above
(C) 2 and 3 only
(D) 2 and 5 only
(E) 4 and 5 only

Ans. Option(C)

Q-2 What is the base class from which all Web forms inherit?
A) Page Class
B) Session Class
C) Master Page
D) None of the Above

Ans. Option(A)

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