Collect/Call Specific Control During The Runtime In FLP

Question

am using C#, VS-2005

I have generated Two Seperate Control at runtime in Flowlayoutpanel1 as below:

The First Control is....

TextBox tb=new TetxBox();

tb.Name="tbox"+i.tostring();

this.FlowLayoutPanel1.Controls.Add(tb);

Another Control is.......

TextBox bb= new TextBox();

bb.Name="tbbox"+i.tostring();

this.FlowLayoutPanel1.Controls.Add(bb);

now both control available at FLP1

if i am reference them or collect them with foreach loop then both control are references/collected.

my question is if I have to collect or reference only one control out of two then how to make coding on it.

suppose I have to put "tbox" on if condition then how to do. but keep in mind that "tbbox" should not effected.