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TabControl.TabPageCollection.IndexOf Method

Returns the index of the specified tab page in the collection.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

public int IndexOf(
	TabPage page


Type: System.Windows.Forms.TabPage
The TabPage to locate in the collection.

Return Value

Type: System.Int32
The zero-based index of the tab page; -1 if it cannot be found.


The value of page is null.

The following code example creates a TabControl with one TabPage. This example uses the IndexOf method to retrieve the tabPage1 index value. A ToolTip is used to display this value.

Use the System.Drawing and System.Windows.Forms namespaces for this example.

using System.Drawing;
using System.Windows.Forms;

public class Form1 : Form
    private TabControl tabControl1;
    private TabPage tabPage1;

    public Form1()
        this.tabControl1 = new TabControl();
        this.tabPage1 = new TabPage("myTabPage");

        this.tabControl1.ShowToolTips = true;
        this.tabControl1.Location = new Point(25, 25);
        this.tabControl1.Size = new Size(250, 250);

        this.tabPage1.ToolTipText = "TabIndex = " +
            // Gets the tabPage1 TabIndex value from the tabControl1 controls collection.
            // Converts the tabPage1 TabIndex value to a string.

        this.ClientSize = new Size(300, 300);

    static void Main() 
        Application.Run(new Form1());

.NET Framework

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

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

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.