Occurs when the control is clicked if the Standard Click bit flag is set to true in a derived class.properties are set relative to the size of the view that the user sees, not to the total size including the unseen part.The code is intended to be compiled into a DLL for reference in other applications.Do you want to prevent input that isn't allowed or validate the input before it is possible to proceed?Another efficient use of the user control is to simply preload a Combo Box or List Box with static items you commonly use in almost every application; some examples of this are countries/regions, cities, states, and office locations.For more information about authoring custom controls, see Developing Custom Windows Forms Controls with the . You might consider creating a namespace that contains several classes of user controls and compiling it into one DLL.Gets a value indicating whether the caller must call an invoke method when making method calls to the control because the caller is on a different thread than the one the control was created on.(Inherited from Control.)Invalidates the specified region of the control (adds it to the control's update region, which is the area that will be repainted at the next paint operation), and causes a paint message to be sent to the control.(Inherited from Control.)Invalidates the specified region of the control (adds it to the control's update region, which is the area that will be repainted at the next paint operation), and causes a paint message to be sent to the control.
This gives you the ability to reference the user control in many applications and save time laying out and coding the contained elements of the user control.The former could confuse users when they press keys but nothing happens.It is usually better to show their keypresses but display a warning that the input is currently invalid.If you need to require users to enter data in a well-defined format, such as a telephone number or a part number, you can accomplish this quickly and with minimal code by using the Masked Text Box control.A is a string made up of characters from a masking language that specifies which characters can be entered at any given position in the text box. If the user types an incorrect entry, for example, the user types a letter when a digit is required, the control will automatically reject the input.