Combobox tooltip shows previously selected item

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VB

Private Sub cboTo1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cboTo1.SelectedIndexChanged
        Dim strUsername As String
        Dim strFullName As String
        Dim ctr As Integer
        Try
            For ctr = 0 To Me.DataGridView2.Rows.Count - 1
                strUsername = Me.DataGridView2.Rows(ctr).Cells(0).Value.ToString.Trim
                strFullName = Me.DataGridView2.Rows(ctr).Cells(1).Value.ToString.Trim      
                If Me.cboTo1.Text = strUsername Then
                    Me.ToolTipCombo.Show(strFullName, Me.cboTo1, 5000)
                End If
            Next
        Catch
        End Try
    End Sub

Please I have about 15 combo boxes populated with usernames. Now, I have the full names of the users

stored in MSSQL database. When you select any username, then it should display the full name

of the selected user. This displays correctly when I select each combobox once. But when I select a

different username in the same combobox, the previously selected username's tooltip rather shows. e.g. For

the first time, I select credible and the tooltip shows "Ben Guff" as full name, and I select powerful,

then "Ben Guff" shows again. Please what could be the problem with code above? Please help. Ben