How to call c# server side method through javascript
<p>I need to call a c# server method through the javascript. I have a gridview in which i have a column with dropdown list. When i change the dropdown's value i need to call a server side method through javascript and change the value of another text box in the gridview.</p>

<p>I am able to do this on the selected index change. but i am slightly worried about the performance. </p>

<p>i am using asp.net c#.</p>

<p>Please let me know how to do this.</p>
