Advance handling for validating event for controls on windows form

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.NET

C#3.5

I am designing a data entry form.
The UI consists of:
1. textbox for user name
2. textbox for user code
3. listview showing a list of names of existing users
4. button to add new user

Now, handling validating event for the 2 textboxes, I have written this code:

void tb_Name_Validating(object sender, CancelEventArgs e)
{
  try
  {
    if(tb_Name.TextLength == 0)
      {
        tb_Code.Enabled = false;
        tb_Name.ForeColor = Color.White;
        tb_Name.BackColor = Color.PaleVioletRed;
        tb_Name.Focus();
      }
  }
  catch (Exception ex)
  {
    MessageBox.Show(ex.ToString());
  }
}

I am not allowing user to move to next control unless user has provided a value for the user name.

Now, problem comes when the input focus is still at tb_Name and user clicks on an item in the listview control.
As soon as user clicks on the listview item, validating event for the textbox tb_Name is fired. And the focus is again remained on the textbox itself with an error (changing backcolor).

I want to bypass validating event. But, I dont know how to tell c# that user has moved to some control other than tb_Code. The validating event must occured only when user tries to move to control tb_Code.

Any help will be highly appreciated.
Thank you!

What I have tried:

I tried going through the order of events for Enter,Leave, GotFocus, LostFocus, validating and validated.
Also, I tried many alternatives but none worked perfectly.