GetNextControl - How to use???

When I Enter a particular control on a WinForm, I need to know the previous control. I have the following code:

private void txtFirstNames_Enter(object sender, System.EventArgs e)
{
    Control currCtl = (Control)sender;  //current control
    Control prevCtl = currCtl.GetNextControl(currCtl, false)   //previous control
    ...
}

The problem with the above code is that prevCtl = null after executing the line.

According to the Microsoft docs (which are totally inadequate - with NO code examples), the format of the GetNextControl method is:

GetNextControl(
   Control ctl, //control to start searching from
   boolean direction  //false - go back; true - go forward
)

What am I doing wrong???? A code snippet will help as well as an explanation of why my code is not working. I'm sure it's something simple.

TIA - NM.

PS: sorry for the low points, but that's all I have left!
NetMeisterAsked:
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MrGhostCommented:
You can't call GetnextControl on the Control which doesn't have childs controls, you shoud try to change:
Control prevCtl = currCtl.GetNextControl(currCtl, false)   //previous control

in somthing like this Control prevCtl = ActiveForm.GetNextControl(currCtl, false)  

because both controls are child controls of a form!

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stevie_bmCommented:
An alternative (if you're not using controls as direct children of the form) is to use:
Control prevCtl = currCtl.Parent.GetNextControl(currCtl, false)   //previous control
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