Property: Text

Private Sub TextBox1_TextChanged(sender As Object, e As EventArgs) Handles TextBox1.TextChanged
    AxBarcode1.Text = TextBox1.Text
End Sub

procedure TForm1.Edit1Change(Sender: TObject);
begin
  barcode1.Text := edit1.Text;
end;  

axBarcode1.Type = BARCODELib.TypeConstants.CODEEAN13;
axBarcode1.Text = "431234100707";
axBarcode1.ForeColor = Color.DimGray;
axBarcode1.BackColor = Color.AntiqueWhite;
axBarcode1.Rotate = 90;
axBarcode1.BorderHeight = 10;
axBarcode1.BorderWidth = 20;
axBarcode1.Alignment = BARCODELib.AlignConstants.ALIGNCENTER;
axBarcode1.NotchHeightInPercent = 50;
axBarcode1.AutoType = false;
axBarcode1.PrintFix = false;
axBarcode1.AboutBox;
axBarcode1.SetDemoText;

Barcode1.Type = 1 ' EAN-13
Barcode1.Text = "431234100707"
Barcode1.ForeColor = vbBlack
Barcode1.BackColor = vbWhite
Barcode1.BorderHeight = 10
Barcode1.BorderWidth = 20
Barcode1.Rotate = 90
Barcode1.Alignment = ALIGNCENTER
Barcode1.NotchHeightInPercent = 50
Barcode1.AutoType = False
Barcode1.PrintFix = False
Barcode1.AboutBox
Barcode1.SetDemoText