How Can I Achieve Asynchronous Postbacks in ASP.NET Using __doPostBack() and Vanilla JavaScript?

Asynchronous Postbacks in ASP.NET: A JavaScript and __doPostBack() Solution

Improving the user experience in ASP.NET often requires asynchronous postbacks. This article demonstrates how to achieve this using the __doPostBack() function and plain JavaScript, avoiding full page refreshes.

Understanding __doPostBack()

The __doPostBack() function initiates server-side processing without a complete page reload. It accepts two arguments: the event source (control ID) and an optional argument to pass data to the server.

Example: Asynchronous Button Click

Consider a button with the ID "btnSave". The following JavaScript function triggers an asynchronous postback, sending a parameter to the server:

<code class="language-javascript">function SaveWithParameter(parameter) {
  __doPostBack('btnSave', parameter);
}</code>

On the server-side (code-behind), retrieve the parameter:

<code class="language-csharp">protected void Page_Load(object sender, EventArgs e) {
  string parameter = Request["__EVENTARGUMENT"]; 
}</code>

Summary

This method provides a straightforward way to implement asynchronous postbacks in ASP.NET web forms using only __doPostBack() and standard JavaScript. This allows server-side processing without disrupting the user interface.

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