Skip to main content

Identifying that the Page is Post Back or not in asp.net

When you need perform different different task according to Get and Post request type then you should know about current request of which type and how to identify it.

What is GET, POST Request -

GET :- When user requests to a web page by typing the URL in web browser, open a window through JavaScript (window.open ..) or clicking in hyperlink its called Get request or first time request.

POST :- When user requests to a web page by clicking in button (input type submit) or submit a form through JavaScript to the server (form.submit() function in JavaScript) its called Post request or second / higher request.

There is two basic way to identifying current request is post back request or not -

  • Page IsPostBack Property
  • Current Request Type Property
Identifying that the Page is Post Back or not in asp.net demo
Identifying that the Page is Post Back or not in asp.net

Page IsPostBack Property-

Page object has an "IsPostBack" property, which can be checked to know that is the page posted back to server or not, if "IsPostBack" property is "True" then page called postback and page loading through the "Post" Request (page loading second or higher time) else if "IsPostBack" property returns false then page is loading through "Get" Request (page loading first time).

if (!IsPostBack)
{
    //Call when page loading first time
}

if (IsPostBack)
{
    //Call when page loading second or higher time (received a posted form data from client)
}

Current RequestType -

Current context request object have property named RequestType which can be checked to know that is the page posted back to server or not just match the http request type words with it i.e. GET, POST, PUT, DELETE etc and work accordingly.

if (Request.RequestType == "GET")
{
  //Call when page loading first time
}

if (Request.RequestType == "POST")
{
   //Call when page loading second or higher time
}

Popular posts from this blog

How to validate dropdownlist in JavaScript

In this article you will see how to put validation in dropdownlist by javascript, suppose first item value of dropdownlist is 0 and text is "-Select-" just like given below and we have to validate that at least one item is selected excluding default i.e "-Select-".

Uploading large file in chunks in Asp.net Mvc c# from Javascript ajax

Often we have a requirement to upload files in Asp.net, Mvc c# application but when it comes to uploading larger file, we always think how to do it as uploading large file in one go have many challenges like UI responsiveness, If network fluctuate for a moment in between then uploading task get breaks and user have to upload it again etc.

Customize comment box in blogger

Now it is possible to customize your blogger comment box in simple way there no need to edit HTML of your blogger just through the adding some simple css to the blogger.

How to handle click event of linkbutton inside gridview

Recently I have posted how to sort only current page of gridview , Scrollble gridview with fixed header through javascript , File upload control inside gridview during postback and now i am going to explain how to handle click event of linkbutton or any button type control inside gridview. We can handle click event of any button type control inside gridview by two way first is through event bubbling and second one is directly (in this type of event handling we need to access current girdviewrow container)