Radio button null

Any input would be appreciated! Tuesday, October 2, PM. WPF 0. Are you seeing that it looks any different than the following? Your code led me to an interesting discovery. I created a window with 6 radio buttons; 3 enabled and 3 disabled with all 3 states represented for each group. The interesting stuff is for a radio button that is disabled with checked set to true - at design time it appears checked but at run time it appears unchecked clearly incorrect behavior. Check out the following picture on my skydrive which I must say is a super-cool free service!

JPG Do you see similar behavior in Vista? Wednesday, October 3, AM. This is clearly an error and I hope that this as well as the data binding issue is fixed in SP1! Thank you for the pointer on using reflection to look at the BulletChrome code to see the real behavior. I appreciate the pointer on overriding the metadata and coercing the values to get the visuals that I need but I'm not totally clear on how to do that.

Could you possibly post a sample on how to show a disabled RadioButton where it's unchecked if IsChecked is null or false and checked if IsChecked is true? Thanks for all your help! I'll take a look at this when I get a chance. Actually, after giving it more thought, value coersion would be the wrong way to go here Thursday, October 4, AM.

Contents Exit focus mode. Radio Button Class Reference Is this page helpful? Please rate your experience Yes No. Any additional feedback? Namespace: System. Forms Assembly: System. In this article. Inherited from Control. Gets or sets the description of the control used by accessibility client applications.

Gets or sets the name of the control used by accessibility client applications. Gets or sets the accessible role of the control. Gets or sets a value indicating whether the control can accept data that the user drags onto it. Inherited from ButtonBase. Gets or sets a value that indicates whether the control resizes based on its contents.

Gets or sets the background color of the control. Gets or sets the background image displayed in the control. Gets a value indicating whether the control can receive focus. Determines if events can be raised on the control.

Gets a value indicating whether the control can be selected. Gets or sets a value indicating whether the control has captured the mouse. Gets the rectangle that represents the client area of the control. Gets or sets the height and width of the client area of the control. Gets the name of the company or creator of the application containing the control. Inherited from Component. Gets or sets the shortcut menu associated with the control. Gets the collection of controls contained within the control.

Gets a value indicating whether the control has been created. Gets the required creation parameters when the control handle is created. Gets or sets the cursor that is displayed when the mouse pointer is over the control. Gets the data bindings for the control. Gets or sets the default cursor for the control.

Gets the space, in pixels, that is specified by default between controls. Gets the internal spacing, in pixels, of the contents of a control. Gets the DPI value for the display device where the control is currently being displayed. Gets the rectangle that represents the display area of the control. Gets or sets a value indicating whether the control can respond to user interaction.

Gets the appearance of the border and the colors used to indicate check state and mouse state. Gets or sets the flat style appearance of the button control. Gets a value indicating whether the control has input focus. Gets or sets the font of the text displayed by the control. Gets or sets the height of the font of the control.

Gets or sets the foreground color of the control. Gets the window handle that the control is bound to. Gets a value indicating whether the control contains one or more child controls. Gets or sets the height of the control.

Gets or sets the image that is displayed on a button control. Gets or sets the alignment of the image on the button control. Gets or sets the image list index value of the image displayed on the button control.

Gets or sets the IME mode of a control. Gets or sets a value indicating whether the control is visible to accessibility applications. Gets or sets a value indicating whether the button control is the default button. Gets a value indicating whether the control has been disposed of. Gets a value indicating whether the control has a handle associated with it. Gets a value indicating whether the control is mirrored. Gets a cached instance of the control's layout engine.

Gets or sets the space between controls. Gets or sets the name of the control. Gets or sets padding within the control. Gets or sets the parent container of the control. Gets the size of a rectangular area into which the control can fit.

Gets the product name of the assembly containing the control. Gets the version of the assembly containing the control. Gets a value indicating whether the control is currently re-creating its handle.

Gets or sets the window region associated with the control. This property is now obsolete. Gets or sets a value indicating whether the control redraws itself when resized. Gets a value that determines the scaling of child controls.

Gets a value indicating whether the control should display focus rectangles. Gets or sets the site of the control. Gets or sets the height and width of the control. Gets or sets the tab order of the control within its container. Gets or sets the object that contains data about the control. Gets or sets the text associated with this control.

Gets or sets the position of text and image relative to each other. Gets or sets a value indicating whether the control and all its child controls are displayed. Gets or sets the width of the control. BeginInvoke Action.

BeginInvoke Delegate. BeginInvoke Delegate, Object[]. Brings the control to the front of the z-order. Contains Control. Retrieves a value indicating whether the specified control is a child of the control. Creates a new instance of the control collection for the control.

Creates a handle for the control. CreateObjRef Type. Inherited from MarshalByRefObject. DefWndProc Message. Sends the specified message to the default window procedure. Destroys the handle associated with the control. Dispose Boolean. Begins a drag-and-drop operation. DrawToBitmap Bitmap, Rectangle. Supports rendering to the specified bitmap. EndInvoke IAsyncResult. Equals Object. Determines whether the specified object is equal to the current object. Inherited from Object. Retrieves the form that the control is on.

Sets input focus to the control. GetChildAtPoint Point. Retrieves the child control that is located at the specified coordinates. Serves as the default hash function. GetNextControl Control, Boolean. Retrieves the next control forward or back in the tab order of child controls. GetPreferredSize Size. Retrieves the size of a rectangular area into which a control can be fitted. Retrieves the bounds within which the control is scaled. GetService Type. GetStyle ControlStyles.

Retrieves the value of the specified control style bit for the control. Determines if the control is a top-level control.

Conceals the control from the user. Obtains a lifetime service object to control the lifetime policy for this instance. Called after the control has been added to another container.

Invalidates the entire surface of the control and causes the control to be redrawn. Invalidate Boolean. Invalidate Rectangle. Invalidate Rectangle, Boolean. Invalidate Region. Invalidate Region, Boolean. Invoke Action. Executes the specified delegate on the thread that owns the control's underlying window handle. Invoke Delegate. Invoke Delegate, Object[]. IsInputChar Char. That's because it will never be empty. You gave it a default value, "false".

Check against that:. It'd probably be better setting this false element to an empty string, and then compare it with ''. Also, I don't recommend using to suppress warnings, so try this:. How are we doing? Please help us improve Stack Overflow. Take our short survey. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow.

Learn more. PHP radio button check if null Ask Question. Asked 9 years, 3 months ago. Active 3 years, 4 months ago. Viewed 21k times. When an item in a RadioButtons group already has focus, the user can use arrow keys for "inner navigation" between the items within the group. The Left and Right arrow keys move spatially. The Up arrow and Down arrow keys move between items.

The Left arrow and Right arrow keys do nothing. The Left and Up arrow keys move to the previous item, and the Right and Down arrow keys move to the next item. When focus is on the last item in a column and the Right or Left arrow key is pressed, focus moves to the last item in the next or previous column if any. When focus is on the last item in a column and the Down arrow key is pressed, focus moves to the first item in the next column if any. When focus is on the first item in a column and the Up arrow key is pressed, focus moves to the last item in the previous column if any.

For more information, see Keyboard interactions. The RadioButtons group doesn't wrap focus from the first row or column to the last, or from the last row or column to the first. This is because, when users use a screen reader, a sense of boundary and a clear indication of beginning and end is lost, which makes it difficult for users with visual impairment to navigate the list. The RadioButtons control also doesn't support enumeration, because the control is intended to contain a reasonable number of items see Is this the right control?

When you use the keyboard to navigate between items in a RadioButtons group, as focus moves from one item to the next, the newly focused item gets selected and the previously focused item is cleared. Focus and selection after keyboard navigation, where the Down arrow key moves focus to radio button 3, selects it, and clears radio button 2.

After focus is moved, you can use the Spacebar to select the item that currently has focus. If you use an Xbox gamepad or remote control to move between radio buttons, the "selection follows focus" behavior is disabled, and the user must press the "A" button to select the radio button that currently has focus. The following table describes how Narrator handles a RadioButtons group and what is announced. This behavior depends on how a user has set the Narrator detail preferences.

The name that Narrator announces for each item is the value of the AutomationProperties. Name attached property if it is available for the item; otherwise, it is the value returned by the item's ToString method. N is the total number of items in the group. The RadioButtons control uses a content model similar to an ItemsControl.

This means that you can:. Here, you declare a simple RadioButtons control with three options. The Header property is set to give the group a label, and the SelectedIndex property is set to provide a default option. To take an action when the user selects an option, handle the SelectionChanged event. You can also get the selected item from the SelectionChangedEventArgs. AddedItems property. AddedItems[0] as string;. A radio button has two states: selected or cleared.

When an option is selected in a RadioButtons group, you can get its value from the SelectedItem property, and its location in the collection from the SelectedIndex property. A radio button can be cleared if a user selects another radio button in the same group, but it can't be cleared if the user selects it again.