Another Class Issue

Hi,

Sending this data to a list box, every time I click submit it makes an index entry even if the data is invalid. When it finally is valid there are several entries before the valid one.

  {
            int IDNumber = 0;
            
            if(nameTextBox.Text == "")
            {
                MessageBox.Show("Invalid Name");
                return;
            }


            if (departmentTextBox.Text == "")
            {
                MessageBox.Show("Invalid Department");
                return;
            }


            if (positionTextBox.Text == "")
            {
                MessageBox.Show("Invalid Position");
                return;
            }

            if (int.TryParse(idNumberTextBox.Text, out IDNumber))
            {
                employee.IdNumber = IDNumber;
            }
            else
            {
                MessageBox.Show("Invalid ID Number");
                return;
            }



        }

 private void addEmployeeButton_Click_1(object sender, EventArgs e)
        {
            Employee myEmployee = new Employee();

            GetEmployeeData(myEmployee);

            employeeList.Add(myEmployee);

            employeeListBox.Items.Add(myEmployee.Name);

            nameTextBox.Clear();
            idNumberTextBox.Clear();
            departmentTextBox.Clear();
            positionTextBox.Clear();
        }

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