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Control.FindControl Method (String)

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

Namespace:  System.Web.UI
Assembly:  System.Web (in System.Web.dll)

public virtual Control FindControl(
	string id
)

Parameters

id
Type: System.String

The identifier for the control to be found.

Return Value

Type: System.Web.UI.Control
The specified control, or null if the specified control does not exist.

Use FindControl to access a control from a function in a page's code, 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 recursively search through 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: Locate Controls by ID in an ASP.NET Web Page.

TopicLocation
How to: Reference ASP.NET Master Page ContentBuilding ASP .NET Web Applications
How to: Reference ASP.NET Master Page ContentBuilding ASP .NET Web Applications

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 noteSecurity 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, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

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