How to Get the Index of a Control on a Web Form?

After searching the KB, I did not find the answer to this question, but I'll bet the answer is out there some where. I've done this in VB, but cannot determine how to do this in C#.

On a web form, I have many textbox controls. One of the controls is named txtFirstName. In VB, if I were to assign the *name* of this control to a string variable, I could then reference the variable in order to access a control, instead of referencing the control directly. For example:

strControlName = "txtFirstName"
Me(strControlName).Focus()

I would like to know how this is done in C#, either by referencing a variable that stores the control name, or by referencing the index value of a control. The following does not work in C#:

this.Controls[strControlName].Focus();

If I knew the index, maybe I could do something like:

intIndex = <control index value>
this.Controls.IndexOf[intIndex].Focus();
or
this.Controls.IndexOf[this.txtFirstName].Focus();

Thanks
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brian_appliedcpuAsked:
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burakiewiczConnect With a Mentor Commented:
this.FindControl("ControlName").Focus();
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Erick37Commented:
Use the Find method of the Controls collection:

this.Controls.Find("textBox2", true)[0].Focus();
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käµfm³d 👽Commented:
In lieu of the others answers, which are on point, the reason your approach doesn't work, most likely, is that the control you are searching for is the child of some other control, which may be the child of some control, which may...   ...until you get to the form itself. You could write a recursive function or an iterative loop to find the control, but FindControl() does what it sounds like, so why reinvent the wheel  :)
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Erick37Commented:
I should have read the title :/
Controls.Find is Win forms.
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brian_appliedcpuAuthor Commented:
Thank you burakiewicz
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