16/02 User Control:

Date 16-2-11 Wednesday

User Control: - These are controls that are created or developed by the programmers. To consume under your application there are of two types –

1.       

    Creating a new control from existing controls.

2.       

      - Inherited or Extended Controls.

- In the first case, we create new controls making use of existing controls, so to design the control first we need to define a class inheriting from the predefined class i.e. user control, which provide the container required for designing.

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Syntax -

public class StopClock : UserControl {   // Design the control   // write behavior for the control }

 

- In the second case without designing any control we only copy the design of an existing control and add functionalities or behavior to the control.

In this case, we define a class inheriting from the control class and we have to add new behavior.

public class NumericTextBox : TextBox {    // write the code for accepting only numeric’s }

Note – To create a control in the first process we need to add an item template of the type user control, which provide a class inheriting from UserControl class.

            Where as in the second case we need to add a item template of type class and than

Inherit from the control class we want to extend.