This post is related to Windows Form : Control Focus function not working issue.
Sometimes there is a case when you want to set the focus on a particular control in your windows form. To do this you have a function focus for the controls. By using this you can set the focus on a particular control but you need to remember some limitations to use this function. Which is a control can be selected and receive input focus if all the following are true: the Selectable value of ControlStyles is set to true, it is contained in another control, and all its parent controls are both visible and enabled.
Focus is a low-level method intended primarily for custom control authors. Instead, application programmers should use the Select method or the ActiveControl property for child controls, or the Activate method for forms
The following code snippet sets focus on the specified Control, if it satisfy the requirements to set focus on it:
public void ControlSetFocus(Control control)
// Set focus to the control, if it can receive focus.
You can read the complete guidelines on this topic using below microsoft link:
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