how to Check if already exists a employer in the list with same code entered in textbox

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C#

Hello,

I need your help, if it is possibe.

I need to check if already exists a employer in the list with same code entered in the textbox.

I have a list of employers, and I add employers like this :

else if (cb_type.Text == type1.text)
{

     type1 typeone = new typeone(Convert.ToInt32(tb_Code.Text), tb_Name.Text, Convert.ToDateTime(dateTimePicker1.Text), cb_Sex.Text, tb_Adress.Text, Convert.ToInt32(tb_Phone.Text), tb_Email.Text, pictureBox1.Image);
     LEmployer.Add(typeone);
     listBox1.Items.Add(V.getName());
     listBox1.Show();
}

In the moment that i add a new employer i need to verify if already exists a employer with the same code that is entered in textbox.

I try this :

foreach (employer E in Lemployer)
{
      if tb_code.text == E.getCode())
      {
           Messagebox.show("Code Already exists");
      }
}

But this isn't working, someone can help me doing this?

Thanks