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It s a good idea to rename the UserControl to a more meaningful name, as this will be your control s name Follow these steps: 1 Right-click on the UserControl1cs file in the Solution Explorer, and select Rename Enter an appropriate name 2 In the code module associated with the UserControl interface, find the class name and change it to your new name You should also ensure that the namespace has a meaningful name as well (Don t forget to change the constructor name) Adding Constituent Controls to the UserControl The next step is to add the constituent controls to the UserControl This is done in the same way as placing controls on a Windows Form double-click on the control from the Toolbox, or select the control and drag it into place As an example, create a composite control called StudentValidate that can be used in the college project This control should contain five constituent controls two Label controls to display Student Number: and Student Name: , two TextBox controls to contain the student number and student name, and a Button for validating the input The composite control is shown in Figure 22-7 Be sure to name all of your controls appropriately and not leave them as Button1, TextBox1, and so forth Adjusting the Constituent Controls You can now go into the constituent controls and adjust their properties The first properties that should concern you are the size and position of the controls Place them as you want to see them in your final product Be aware that the user of your control can adjust the sizes and move the controls if you leave them with that ability the properties that allow these changes are exposed for the UserControl If you allow the user to adjust sizes and positions, you must also provide code within the control s interface that adjusts the control accordingly TIP Set the size of the UserControl to be large enough to just hold the constituent controls Remember that the UserControl will be a control in the Toolbox, and it will be added to another developer s project In the StudentValidate example, you could set the ReadOnly property of the student name text box to True, since you don t want to allow the user to initially type into the text box This text box should act as a display only You can also add any additional properties to your new control as we did earlier in the chapter for a simple extended control: 1 In the code editor, add the private variables for the properties 2 Create the property procedures.

Figure 22-7

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EXAM TIP Always use properties for your controls (instead of public variables) the Visual Studio NET designer program will only display properties, not variables In the next section, Exposing Properties of the Constituent Control, we will examine the code to not only add new properties but also to expose the existing properties of the constituent control remember, by default, they are hidden from the user of your control

Once you have set all properties to your initial values, the next step is to decide what you will allow the user of your control to do Exposing Properties of the Constituent Control Let s examine how you can allow the user of your composite control to take advantage of the functionality of its constituent controls For this discussion, add a CheckBox control to the StudentValidate project, as shown in the following illustration

This CheckBox should remain invisible until the student number has been validated since we don t want the user to have access to it until the validation is performed To accomplish this, you just need to create a public property that exposes the constituent control s Visible property:

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public bool cbValid_Visible { set { if (cbValidVisible == false) cbValidVisible = true; else cbValidVisible = false; } }