Comments by Divya Srivastava (Top 1 by date)

1. You can use hidden field to set the current tab value .
<asp:hiddenfield id="hdnCurrentTab" value="0" runat="server">
2. To get the hiddenfield value in Js
var currentTab = document.getElementById('hdnCurrentTab').value;
3. You need to set the Hiddenfield value in JS Function (wherever you are changing
the currentTab Variable )
document.getElementById('hdnCurrentTab').value=currentTab;
This is all about hiddenField to Set and Get in the JS. This will solve your problem to
set the current tab in the postback event.

Some important points to understand related to Hidden Field in C#.
1. Hidden Field is a form control. Form Control value is maintained by doing POST.
As long AS the control is created in the page life cycle,the Posted value will be set
on the control.
2. But If you refresh the page or click on a hyperlink does a GET,
then the value will be lost or revert to the designer-generated(aspx page) default.

Hope you got the answer.