hi ,
When you select the first row there is no problem coz the event fires once ok, but the problem accurse when you select other row coz the event (which is ListView1_SelectedIndexChanged) fires twice once for deselect the first row and the other for select the second row. So the message "Specific argument was out of the range of valid values. Parameter name: Index " show because deselect the first row you chosen. I hope I could explain well :cheesy:

Any way the solution is by adding if statement before the retrieve of the list row information

VB.NET Syntax (Toggle Plain Text)

If ListClient.SelectedItems.Count = 0 Then Exit Sub
       Try
            With ListClient
 
                intIndex = .SelectedIndices(0)
 
                lngPClientId = .Items(intIndex).Text
                Me.lblClientId.Text = lngPClientId
                txtClientName.Text = .Items(intIndex).SubItems(1).Text
                txtAcctMgr.Text = .Items(intIndex).SubItems(2).Text
 
                intIndex = 0
            End With
 
        Catch ex As Exception
            MessageBox.Show(ex.Message)
        End Try

If ListClient.SelectedItems.Count = 0 Then Exit Sub Try With ListClient intIndex = .SelectedIndices(0) lngPClientId = .Items(intIndex).Text Me.lblClientId.Text = lngPClientId txtClientName.Text = .Items(intIndex).SubItems(1).Text txtAcctMgr.Text = .Items(intIndex).SubItems(2).Text intIndex = 0 End With Catch ex As Exception MessageBox.Show(ex.Message) End Try