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The cause of this change is the Modifiers property setting. This is not an actual property in the C# sense, and does not appear in the documentation for the Button class. This setting appears in the Properties window within Visual Studio to allow the access level for a control to be set. There are five possible values of this setting, as shown in the following table:

x=10/y~(127/x); x = 10 / y ~(127/x);

Another essential method of data storage magnetic media was developed for the UNIVAC I in 1951 Magnetic tape improved on the storage density of cards and paper tape by a factor of about 50 and could be read significantly faster Magnetic disks and drums appeared a few years later and improved on magnetic tape, but cards and punched tape were still much cheaper and remained the primary form of data input until the late 1970s IBM

Possible values for the Modifiers property Value Public C# equivalent public Comments for Form inheritance Any class, regardless of where and how it is defined, can modify the control. This is not typically used, since you do not normally want any object to modify the location, size, or other internal control settings of your form. Any subclass of the form, regardless of where it is defined, can modify the control. Any subclass of the form that is defined in the same assembly can modify the control. Any class in the same assembly, regardless of how it is defined, can modify the control. This is safer than public access, since you typically have control over the classes common to an assembly. No subclass can modify the control. This is the default setting.

Redundant or additional parentheses do not cause errors or slow down the execution of an expression You should use parentheses to clarify the exact order of evaluation, both for yourself and for others For example, which of the following two expressions is easier to read

Based on the table, we could have used either the Protected or Protected Internal setting here. Since there is no reason to prevent derived forms in external assemblies from modifying the Panel control, the Protected value will work just fine. Before we move on, notice that our subclasses will not be able to add Click handlers for our private buttons. The OK and Cancel buttons have assigned actions due to their DialogResult setting. When either button is clicked, the dialog is deactivated and the appropriate value returned. We will require a way to save our modified settings when the OK button is clicked, and we need a way to perform an action when the Reset button is clicked. As a solution, let s add two protected methods that child classes can implement to handle these situations. We will create a SaveSettings method to store the modified values, and a ResetSettings method to handle a click of the Reset button. This continues our previous steps.

x=y/3-34*temp&127; x = (y/3) - (34*temp) & 127;

1Unlike Jacquard, whose system enjoyed widespread success, Babbage seemed incapable of finishing anything he started He never completed any of his mechanical calculating devices, although his designs were later proven correct when they were turned into functioning models by other builders 2Modern card readers of the 1970s still used only 72 to 80 characters per card but could scan over a thousand cards per second

C has a special shorthand that simplifies the coding of a certain type of assignment statement For example

CREATE OVERRIDABLE METHODS FOR OK AND RESET BUTTONS Action 6 Create a protected virtual method for resetting the form. Result

x = x + 10;

protected virtual void ResetSettings() { // Subclasses override to reset form } private void btnReset_Click (object sender, System.EventArgs e) { ResetSettings(); } protected virtual bool SaveSettings() { // Subclasses override to save form return true; }

x += 10;