Equivalent to refer to control by variable name?

Question

In VB I can loop through controls, or refer to a control by concatenating a variable to a string. Something like:

Dim I as integer
I = 1
Me[\"Textbox\" & I]         


        

Answer 1

 int I = 1;
 this["Textbox" + I].Text = "some text";

OR

 int I = 1;
 this.Page["Textbox" + I].Text = "some text";

OR

 int I = 1;
 this.Controls["Textbox" + I].Text = "some text";