Pre render event in asp.net

Question

protected void rgStateTax_PreRender( object sender, EventArgs e )
{
    if( rgStateTax.MasterTableView.IsItemInserted )
    {
        foreach( GridItem item in rgStateTax.Items )
        {
            item.Visible = false;
        }
    }

    if( rgStateTax.EditItems.Count > 0 )
    {
        foreach( GridDataItem item in rgStateTax.Items )
        {
            if( item != rgStateTax.EditItems[0] )
            {
                item.Visible = false;
            }
        }
    }
}

Here, rgStateTax is a Rad grid control. Is there any reason for marking the items as invisible? PreRender is the event before the page is actually displayed on the screen, right?.

Answer 1

PreRender is the event that takes place just before the HTML for a given control/page is generated (to later be sent to the browser). So by setting an item.Visible = false here it will not be rendered to the HTML (however it's ViewState will).

In this case it looks like the code is hiding all rows in the RadGrid when a user is editing/inserting an item I presume for less distractions for the end user.

Answer 2

In the interest of teaching a man to fish:

http://blog.tieredsolutions.com/images/o_aspNet_Page_LifeCycle_s-1.jpg

This is your buddy. Learn to love it. :)