Deleting Multiple Records From ListView Using ASP.Net C#?

Question 1

using property name of each checkbox to setup the id of your record. When youchose multiple check box and click on delete filter all checbox checked and read from property name each id the pass those id to you query to delete recordo.

then re-populate your list and rebind to ListItem :)

Take care that i have no idea how is your database i suppose that you have an id as primary key :)

UPDATE SOLUTION TWO STEP TO ACHIEVE YOUR GOAL:

STEP ONE:

Within item tempalte add tooltip and bind it to ID of items of the record:

<asp:checkbox runat="server" id="yourID" ToolTip="<%Eval("ITEMID")%>/>

You will use this data to store the primary key of your record in order to get it in step 2 I assume that you have a button to delete all selected record so in its event on click you may use this code to get all the ids of all checked checkbox

  Protected Sub btnDeleteAllChecked_Click(sender As Object, e As EventArgs)

    Dim ListItems As New List(Of Integer)
    For Each el In listBaiBao.Items
        For Each item In el.Controls
            If TypeOf item Is CheckBox Then
                If DirectCast(item, CheckBox).Checked = True Then
                    ListItems.Add(DirectCast(item, CheckBox).ToolTip)
                End If
            End If
        Next
    Next
    'Delete record from your database 
    Using cnn As New System.Data.SqlClient.SqlConnection(ConfigurationManager.ConnectionStrings("YOURCONNECTIONSTRING").ToString)
        'open the connection
        If cnn.State = ConnectionState.Closed Then cnn.Open()
        'formatting your query string 
        Dim Query As String = String.Format("DELETE FROM YOURTABLENAME WHERE ID IN({0})", String.Join(",", ListItems.ToArray()))

        Using cmd As New System.Data.SqlClient.SqlCommand(Query, cnn)
            'execute delete action, update your select and rebind your list view
            Try
                With cmd
                    .CommandType = CommandType.Text
                    'delete action
                    .ExecuteNonQuery()
                End With
                'ONCE DELETE HAS BEEN PERFORMED CHANGE CMD SELECT STATEMENT AD USE THE SAME COMMAND 
                'TO REBIND A DATABASE OR A DATABLE AS YOU PREFERE LIKE HERE
                Dim Da As New System.Data.SqlClient.SqlDataAdapter(cmd)
                Dim Ds As New System.Data.DataSet
                Da.Fill(Ds)
                'REBIND CONTROL
                listBaiBao.DataSource = Ds.Tables(0)
                listBaiBao.DataBind()
            Catch ex As Exception
                Response.Write(ex.Message)
            End Try
        End Using
    End Using

End Sub

This is based on what i know. I hope it help you. If it solve your issue mark it as answers.If you use Entity framework or any other way to bind your control i need to know in order to help you

Question 2

Written from mind not checked from codes.. If i don't remember wrong ListView has RemoveAt() method which remove item at given index..

with this :

foreach ( ListViewItem item in yourListView.CheckedItems)
{
  yourListView.RemoveAt(yourListView.Items.IndexOf(item));

  //or with another option : 

  yourListView.Remove(item);
}

EDIT : After seen @makemoney2010 's comment..

What kind of Data collection you bind to your ListView? An IList, A DataTable / DataSet, an IDictionary, A DataView? or Something else that you can use in Asp.Net?

Any of i told has Index Implementation on it.. You can use these index implementations..

And as a best practise (to avoid unwanted results) If you bind your data from an Sql based datasource you should implement a primary key..Then everything will be better