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ControlCollection.IndexOf Method

Retrieves the index of a specified Control object in the collection.

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

public virtual int IndexOf(
	Control value
)

Parameters

value
Type: System.Web.UI.Control
The Control for which the index is returned.

Return Value

Type: System.Int32
The index of the specified server control. If the server control is not currently a member of the collection, it returns -1.

Use this method to determine the index location of the specified server control in the ControlCollection object.

The following code example uses the IndexOf method to write the index location of a control, myLiteralControl, in the ControlCollection collection of a Button control named myButton.


// Create a LiteralControl and use the Add method to add it
// to a button's ControlCollection, then use the AddAt method
// to add another LiteralControl to the collection at the
// index location of 1.
LiteralControl myLiteralControl = new LiteralControl("ChildControl1");
myButton.Controls.Add(myLiteralControl);
myButton.Controls.AddAt(1,new LiteralControl("ChildControl2"));
Response.Write("<b>ChildControl2 is added at index 1</b>");

// Get the Index location of the myLiteralControl LiteralControl
// and write it to the page.
Response.Write("<br /><b>Index of the ChildControl myLiteralControl is " +
    "</b>" + myButton.Controls.IndexOf(myLiteralControl));


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

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.

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