how to compare combobox selected item with textbox value

If Not String.IsNullOrWhiteSpace(ComboBox1.Text) And Not String.IsNullOrWhiteSpace(TextBox1.Text) Then
            If ComboBox.Text = TextBox.Text Then
                MsgBox("Match")
            Else
                MsgBox("Not Match")
            End If
End If

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
       {

           if (comboBox1.SelectedItem.ToString() == txtName.Text)
           {
               //do something here
           }
           else
           {
               //do something here
           }
       }