Having a gridview to disappear when doing changes in a listbox

Question

Hi I have a listbox (lstBox1) that is populating a another listbox (lstBox2) with items depending on what is selected in lstBox1. lstBox2 is populated automatically when items in lstBox1 is selected and/or changed (autopostback). Then when I have selected items in both lstBox1 and lstBox2 I have a 'View' button that loads and visualize the result for selected items in lstBox1 and lstBox2. Now to my question - I want that as soon I change item in lstBox1 the visualized gridview shall disappear from the page and first be visualized again after the 'View' button is pushed again. That means I want the autopostback (SelectedIndexChanged) for lstBox1 shall remove visualized gridview and just populate lstBox2 with new items. How to realize this? I must (I assume) of course trigger this in SelectedIndexChanged function for lstBox1 in some way. Thx in advance for your help!

Justin Russo · Answer

You must always databind after every postback. This includes asynchronous calls utilizing AJAX methodologies.

jesbon · Answer

Hi I solved the problem with adding following in the beginning of protected void lstKundNr_SelectedIndexChanged( object sender EventArgs e) { GridView1.Dispose(); GridView1.DataBind(); ... } This will remove datagrid from memory and having it disappear from result page/area.

arun sharma · Answer

use selectedIndexChanged event to hide the datagridView and use Click event to show the datagridview protected void ListBox1_SelectedIndexChanged(object sender EventArgs e) { datagridview1.visible = false; } protected void Button1_Click(object sender EventArgs e) { datagridview1.visible = true; } Arun sharma