ControlExtensions Class

The ControlExtensions methods are extension methods that are available on the ControlCollection object returned by the Worksheet.Controls property (in an application-level project) or the WorksheetBase.Controls property (in a document-level project) at run time. To add a specific control to a document, use the method that includes the name of the control in the method name. For example, to add a Button, use the AddButton method.

For more information about controls to a document, see Adding Controls to Office Documents at Run Time. For more information about extension methods, see Extension Methods (C# Programming Guide) and Extension Methods (Visual Basic).

Note
In Excel add-in projects that target the .NET Framework 4, you must add a reference to the Microsoft.Office.Tools.Excel.v4.0.Utilities.dll assembly before you can access the ControlExtensions methods.

The following code example uses the AddButton method to add a Button control to cell A1, and then adds text to the button. To use this example, run it from the Sheet1 class in a document-level project.

private void ExcelRangeAddButton()
{

    Microsoft.Office.Tools.Excel.Controls.Button button1 =
        this.Controls.AddButton(this.Range["A1"], "button1");
    button1.Text = "OK";
}

Reference