The CreateParams property should not be overridden and used to adjust the properties of your derived control. Properties such as the CreateParams..::.Caption, CreateParams..::.Width, and CreateParams..::.Height should be set by the corresponding properties in your control such as Control..::.Text, Control..::.Width and Control..::.Height. The CreateParams should only be extended when you are wrapping a standard Windows control class or to set styles not provided by the Windows Forms namespace. For more information about creating control parameters, see the CreateWindow and CreateWindowEx functions and the CREATESTRUCT structure documentation in the MSDN library at http://msdn.microsoft.com/library.

When overriding the CreateParams property in a derived class, use the base class's CreateParams property to extend the base implementation. Otherwise, you must provide all the implementation.

The following code example extends the CreateParams property of a Button derived class. The CreateParams..::.Style property is changed, which causes the button to display an Icon rather than an Image. This example requires that you have a class that inherits from the Button class.

Protected Overrides ReadOnly Property CreateParams() As System.Windows.Forms.CreateParams
    Get
        Dim SecPerm As New SecurityPermission(SecurityPermissionFlag.UnmanagedCode)
        SecPerm.Demand()

        ' Extend the CreateParams property of the Button class.
        Dim cp As System.Windows.Forms.CreateParams = MyBase.CreateParams
        ' Update the button Style.
        cp.Style = cp.Style Or &H40 ' BS_ICON value

        Return cp
    End Get
End Property

protected override CreateParams CreateParams
{
    get
    {
        new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Demand();

        // Extend the CreateParams property of the Button class.
        CreateParams cp = base.CreateParams;
        // Update the button Style.
        cp.Style |= 0x00000040; // BS_ICON value

        return cp;
    }
}

virtual System::Windows::Forms::CreateParams^ get() override
{

   // Extend the CreateParams property of the Button class.
   System::Windows::Forms::CreateParams^ cp = __super::CreateParams;

   // Update the button Style.
   cp->Style |= 0x00000040; // BS_ICON value
   return cp;
}

.NET Framework

.NET Framework Client Profile

• SecurityPermission 

  for inheriting classes to call unmanaged code when getting the property value. Associated enumeration: SecurityPermissionFlag..::.UnmanagedCode

• SecurityPermission 

  for the immediate caller to call unmanaged code when getting the property value. Associated enumeration: SecurityPermissionFlag..::.UnmanagedCode

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

Reference