Control.FindControl Method (String)
Searches the current naming container for a server control with the specified id parameter.
Assembly: System.Web (in System.Web.dll)
Parameters
- id
- Type: System.String
The identifier for the control to be found.
Return Value
Type: System.Web.UI.ControlThe specified control, or null if the specified control does not exist.
Use FindControl to access a control from a function in a code-behind page, to access a control that is inside another container, or in other circumstances where the target control is not directly accessible to the caller. This method will find a control only if the control is directly contained by the specified container; that is, the method does not search throughout a hierarchy of controls within controls. For information about how to find a control when you do not know its immediate container, see How to: Access Server Controls by ID.
| Topic | Location |
|---|---|
| How to: Reference ASP.NET Master Page Content | Building ASP .NET Web Applications |
| How to: Reference ASP.NET Master Page Content | Building ASP .NET Web Applications |
| How to: Reference ASP.NET Master Page Content |
The following example defines a Button1_Click event handler. When invoked, this handler uses the FindControl method to locate a control with an ID property of TextBox2 on the containing page. If the control is found, its parent is determined using the Parent property and the parent control's ID is written to the page. If TextBox2 is not found, "Control Not Found" is written to the page.
Security Note |
|---|
This example has a text box that accepts user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview. |
private void Button1_Click(object sender, EventArgs MyEventArgs) { // Find control on page. Control myControl1 = FindControl("TextBox2"); if(myControl1!=null) { // Get control's parent. Control myControl2 = myControl1.Parent; Response.Write("Parent of the text box is : " + myControl2.ID); } else { Response.Write("Control not found"); } }
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
Security Note