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].Text = "Some text"

What is the C# equivalent of this last statement?

Answer 1

int i = 1;
this.Controls["TextBox" & i].Text = "Some text";

The above code is assuming that it is in a Control/Form.

Answer 2

Close to SysDragan' solution, but Me just needs to be replaced with this. And yes, you need to specify the Controls collection.

this.Controls["TextBox" & I].Text = "Some text";

Answer 3

 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";