How can I clear a datatable in asp listview? - asp.net

Question

When I use the code below, I remove the datatable values, but the data table structure still exists and displays empty fields (see pics) with the DOM explorer showing an empty table and table rows.
How can I clear the datatable values and the table itself? This way when I repopulate search again, the empty smaller table isn't present?
lvwOutput.Items.Clear();
lvwOutput.DataSource = null;
lvwOutput.DataBind();
Before
After items.clear and datasource = null

Answer 1

This is ridiculous and I believe there is a better way to do this, but the never ending server/client battle makes this harder than it should be. My listview binded to a datatable is called lvwOutput.
In my btnClear I had to put the following. You cannot hide the element or clear the items in the server side asp code for this to work
ScriptManager.RegisterStartupScript(Page, GetType(), "emptyTable", "javascript:emptyTableRows(); ", true);
In my javascript code I had to put the following, this clears the client code
function emptyTableRows(){
var tableHeaderRowCount = 0;
var table = document.getElementById('lvwOutputTable');
var rowCount = table.rows.length;
for (var i = tableHeaderRowCount; i < rowCount; i++) {
table.deleteRow(tableHeaderRowCount);
}
}
And then in the portion of my code that would display the listview and datatable when the user initiates another sql search. This clears the server side.
lvwOutput.Items.Clear();
lvwOutput.DataSource = null;
lvwOutput.DataBind();

Answer 2

You can create a property the stores the data table in session that way you can access it during the click event.
DataTable dtbleDataSource
{
get
{
return Session["dataSource"] as DataTable
}
set
{
Session["dataSource"] = value;
}
}
In your click event you can say:
dtbleDataSource.Reset();