Why DrawText only in the latest bar?

[nasdaq5048]

I have the following code:

protected override void OnBarUpdate()
{

if (CurrentBar < 1) { return; }
double number = (Open[0] - Close[1]);
double number1 = Math.Round(number, 4);
{
if (ToTime(Time[0]) == ToTime(07,30,00))
this.DrawText("tag", false, number1.ToString(), 0, Open[0]-number1, 0, Color.White, new Font("Arial", 10), StringAlignment.Center, Color.Aquamarine, Color.LightGray, 0);

Why the DrawText only draw in the latest day and not from previous day as my code is suppose to say draw the (Open[0] - Close[1]) every time at 7:30:00? Can anybody please help? Thanks.

[TAJTrades]

I have the following code:

protected override void OnBarUpdate()
{

if (CurrentBar < 1) { return; }
double number = (Open[0] - Close[1]);
double number1 = Math.Round(number, 4);
{
if (ToTime(Time[0]) == ToTime(07,30,00))
this.DrawText("tag", false, number1.ToString(), 0, Open[0]-number1, 0, Color.White, new Font("Arial", 10), StringAlignment.Center, Color.Aquamarine, Color.LightGray, 0);

Why the DrawText only draw in the latest day and not from previous day as my code is suppose to say draw the (Open[0] - Close[1]) every time at 7:30:00? Can anybody please help? Thanks.

"tag" must be a unique name. Something like tag = Time[0].ToString().

[NinjaTrader_CalH]

Hello nasdaq5048,

Thank you for your post and to TAJTrades for his response.

Additionally, you can use "tag" + CurrentBar for unique names as well.

[nasdaq5048]

Thanks a lot guys. It works now.