asp.net The GridView 'GridView1' fired event PageIndexChanging which wasn't handled

In my early days of developing websites using ASP.NET, i came across the following particular issue.

Whenever i enable paging in my gridview and run the application, the application says, ‘GridView1′ fired event PageIndexChanging which wasn’t handled. I found the following solution very useful.

protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
GridView1.PageIndex = e.NewPageIndex;
DisplayGridView();
}