Docs-->. Net-->api Reference-->system.? Web.? Ui-->control-->methods-->find? Control

https://docs.microsoft.com/en-us/dotnet/api/system.web.ui.control.findcontrol?view=netframework-4.7

FindControl (String)

Searches the current naming container for a server control with the specified id parameter.

 Public Virtual System.Web.UI.Control FindControl (string ID);

Parameters

Id

String

The identifier for the control is found.

ReturnsControl

The specified control, or null if the specified control does not exist.

Remarks

Use FindControl to access a control from a function with a Code-behind page, to access a control, which is inside another cont Ainer, or in other circumstances where the target control was not a directly accessible to the caller.

This method would find a control only if the control was directly contained by the specified container; That's, the method does not search throughout a hierarchy of controls within controls.

For information what to find a control when the know its immediate closest container, see how to:access Server Co Ntrols by ID.

Docs-->. Net-->api Reference-->system.? Web.? Ui-->control-->methods-->find? Control