Having a gridview to disappear when doing changes in a listbox

jesbon

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!

3 Replies

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Justin Russo17y ago
You must always databind after every postback. This includes asynchronous calls utilizing AJAX methodologies.
0
jesbon17y ago
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.
0
arun sharma17y ago
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
0