# Rounded Corners

The newest Windows OS 11 brings plenty of great features where the [rounded corners](https://learn.microsoft.com/en-us/windows/apps/desktop/modernize/apply-rounded-corners) are just a piece of the improved design. It would bring a more elegant experience to your forms in desktop applications giving smooth rounded edges and shadow effect:

![Telerik UI for WinForms control with rounded corners](https://www.telerik.com/products/winforms/documentation/assets/7fbf214698bcf5765828ba2d94aef696/tpf-rounded-corners001.png)

The rounded corners are enabled by default when the operating system is Windows 11. This functionality can be controlled by the Telerik.WinControls.WindowsSettings.**EnableRoundedCornersDefaultValue** property.

> note As of R3 2023 the rounded corners are available for the ShapedForm as well. It is recommended to use the above API with rectangular shapes, other shapes may lead to unexpected results.

A closer look at the difference of the form's edges with disabled rounded corners vs enabled is illustrated here:

| EnableRoundedCorners=false                                                                                                                                                          | EnableRoundedCorners=true                                                                                                                                                                         |
| ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| ![Telerik UI for WinForms rounded corner style example](https://www.telerik.com/products/winforms/documentation/assets/f8bf4c303b087d0c0b82b76250a3d9a1/tpf-rounded-corners003.png) | ![Telerik UI for WinForms rounded corners with native window methods](https://www.telerik.com/products/winforms/documentation/assets/4f83e7ab81242dd5b9d434697d931dfd/tpf-rounded-corners004.png) |

## Requirements

In order to benefit the rounded corners in forms, popups, menus coming with Windows 11, please ensure that the following requirements are fulfilled:

* Use Telerik UI for WinForms suite version **R3 2021 SP1** or **newer**.

* Make sure that Windows 10 version is defined in the app.manifest file:

```XML
  <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
    <application>
      
      
      <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}"/>

    </application>
  </compatibility>

```

* Ensure that the Telerik.WinControls.WindowsSettings.**EnableRoundedCornersDefaultValue** is enabled. By default, it is set to true.

## RoundedCornersStyle

The public static **WindowsSettings** class defines windows settings related to RadForm and RadControl. It offers the **RoundedCornersStyle** property which determines how two corners will be rounded base on the RoundedCornersStyle enum. If no style is defined, the WindowsSettings.**RoundedCornersStyleDefaultValue** is considered which value is RoundedCornersStyle.**Round**. The available options are:

* **Default** - Let the system decide whether or not to round window corners.

* **None** - Never round window corners.

* **Round** - Round the corners if appropriate.

* **RoundSmall** - Round the corners if appropriate, with a small radius.

#### Disable rounded corners globally

 



```C#

Telerik.WinControls.WindowsSettings.EnableRoundedCornersDefaultValue = false;

```

```VB.NET
Telerik.WinControls.WindowsSettings.EnableRoundedCornersDefaultValue = False

```



Each RadForm and popup instance (RadPopupControlBase) offers **WindowsSettings** property which contains two main properties:

* **EnableRoundedCorners** - can be set to each form instance. If this property is set on the form instance, the global static **EnableRoundedCornersDefaultValue** property is ignored.

* **RoundedCornersStyle** - can be set to each form instance. If this property is set on the form instance, the global **RoundedCornersStyleDefaultValue** property value is ignored.

#### Specify rounded corners individually

 



```C#

RadForm form = new RadForm();
form.WindowsSettings.EnableRoundedCorners = true;
form.WindowsSettings.RoundedCornersStyle = RoundedCornersStyle.RoundSmall;
form.Show();

```

```VB.NET

Dim form As RadForm = New RadForm()
form.WindowsSettings.EnableRoundedCorners = True
form.WindowsSettings.RoundedCornersStyle = RoundedCornersStyle.RoundSmall
form.Show()

```



## NativeMethods

Telerik.WinControls.NativeMethods contains method that allows to apply rounded corners style to each form:

 



```C#

Telerik.WinControls.NativeMethods.ApplyRoundedCorners(form.Handle, 2); 

```

```VB.NET

Telerik.WinControls.NativeMethods.ApplyRoundedCorners(form.Handle, 2)

```