Step 3: Change the extension of the file to .ascx in .NET

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Step 3: Change the extension of the file to .ascx
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This step involves changing the extension of the file to .ascx. To rename the file, you need to follow these steps: 1. Right -click the user control Web Form file in the Solution Explorer window and select Rename from the shortcut menu. 2. Change the extension of the file to .ascx. Do not leave the user control file open while renaming it. If the user Note control file is open, you will not be able to rename the file.
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Using a user control in a Web Forms page
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After you create a user control, you can use it on another Web Forms page. To do so, you need to register the control and then add it to your Web Forms page. The steps are described as follows.
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Step 1: Register the user control
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This step involves registering the user control that you created. To do so, you'll need to follow these steps: 1. Open the Web Forms page in which you want to add your user control. Open the WebForm1.aspx file that was created by default when you created the Web application project. 2. Write the following code: 3. <%@ Register TagPrefix="Acme" TagName="Product" Src="MyWebForm.ascx" %> This code will register the MyWebForm.ascx file. TagPrefix is an alias name that is used to identify the namespace on the Web Forms page to which it is added. The TagName tag contains the alias name for the class that represents the user control. Src is the name of the file that has the user control to be registered. The user control file can be within the same project or another project.
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Step 2: Add the user control to your Web Forms page
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This step involves adding the user control to your Web Forms page. To do so, use the following code: <Acme:Product id="MyProduct" runat="Server"/> The code given needs to be placed in the script where you want the control to appear on the page. In most cases, the code is placed in the <BODY> region of the page within the <FORM> element. In this code: Acme is the TagPrefix for your user control. MyProduct is the ID of your user control. You'll use this ID to refer to the control in programs.
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Your Web Forms page will display the user control when you run the program. Developing a composite control You can create new controls using one or more existing controls. Such controls that aggregate a number of controls are referred to as composite controls. The primary difference between composite controls and user controls is that composite controls are compiled into assemblies and the compiled file is included into the project in which you want to include the control. In this section, we will create a composite control in C# and use it on an ASP page.
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Concepts involved in creating a composite control
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When you create a composite control, you need to do the following: Define the class that implements the composite control. The class needs to inherit from the Control class and, optionally, the INamingContainer class. Optionally override the CreateChildControls method of the Control class. The CreateChildControls method creates any child controls that need to be drawn on a page. This method is used in compositionbased rendering, wherein child controls are instantiated and rendered on the page. Optionally implement the Render method of the Control class. You need to implement this method when you use the rendering logic instead of composition to render the ASP page. When you render controls, the performance overhead is less because controls need not be instantiated. Instead, the page is rendered as defined by the Render method. The Render method controls the output of the page at run-time.
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Creating the control
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You have examined the basic concepts to create a control. Let us now create a composite control. We will create the control in C#. The same programming logic can be used in VB.NET as well, except that the syntax will change. The control that we will create comprises a Calendar control, a TextBox control, a Submit button, and a Label control. The user is expected to select his or her date of birth from the calendar, specify their work experience in years, and click the Submit button to ascertain whether he or she is eligible for a job. To create the custom control project, create a new Class Library project in C#. The controls that you need to use on the form are in the System.Web namespace. Therefore, include a reference to the System.Web.dll file. To include the reference, you need to perform the following steps: 1. Select the Add Reference option from the Project menu. The Add Reference dialog box appears. 2. In the Add Reference dialog box, from the .NET tab, select System.Web.dll and click Select. 3. The component moves to the Selected Components list. Click OK to add the reference. After you add a reference to the System.Web.dll file, you can write the code for the control. To code the control, select the class module from the Solution Explorer. In the class module, declare the namespaces that are used by the control by specifying the following statements: using System; using System.Web;
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using System.Web.UI; using System.Web.UI.WebControls; Next, declare the namespace for the control and declare a public class in the namespace. You should also declare the properties that you need to expose for the control. In the following code, we have declared the namespace, class, and a Text property for an EmpElg label. Additionally, we have also left placeholders for the CreateChildControls method and the Click event of the Submit button. namespace CalcControl { /// <summary> /// This class is used to establish if an applicant is ///eligible for job /// </summary> public class CalcClass : Control, INamingContainer { private Label EmpElg; public string Text { get { EnsureChildControls(); return EmpElg.Text; } set { EnsureChildControls(); EmpElg.Text=value; } } protected override void CreateChildControls() { } protected void Submit_Click(object sender, System.EventArgs e) { } } } The following is the code for the CreateChildControls method. In this code, we are declaring a few controls for the form and we are also using literal controls to display plain text on the form. protected override void CreateChildControls() { Controls.Add(new LiteralControl("<h3>Select date of birth : ")); Calendar Cal1 = new Calendar(); //Cal1.TodaysDate();
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Controls.Add(Cal1); Controls.Add(new LiteralControl("<h3>Work Experience (Years) : ")); TextBox WorkEx = new TextBox(); WorkEx.Text="0"; Controls.Add(WorkEx); Controls.Add(new LiteralControl("</h3>")); Button Submit = new Button(); Submit.Text = "Submit"; Controls.Add(new LiteralControl("<br>")); Controls.Add(Submit); Submit.Click += new System.EventHandler(this.Submit_Click); Controls.Add(new LiteralControl("<br><br>")); EmpElg = new Label(); EmpElg.Height = 50; EmpElg.Width = 500; EmpElg.Text = "Check your eligibility."; Controls.Add(EmpElg); } Finally, the code for the Submit button, which is used to check the eligibility of an employee, is as follows: protected void Submit_Click(object sender, System.EventArgs e) { EnsureChildControls(); if (Int32.Parse(((TextBox)Controls[3]).Text)>=5) { if ((((Calendar)Controls[1]).SelectedDate.Year) <= 1975) { EmpElg.Text = "You are eligible to apply for a job in our company!!"; } else { EmpElg.Text = "You are NOT eligible to apply for a job in our company!!"; } } else { EmpElg.Text = "You are NOT eligible for applying for a job in our company!!"; } }
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When the user clicks Submit, this code checks whether the work experience of the user is more than five years. It also checks whether the user is born in or before 1975. When both the conditions are satisfied, the user is considered eligible for the job. Note You can find the complete code for creating a composite control on the companion Web site for this book. Compile the application to create the DLL file for the composite control. After compiling the file, you can proceed and include the file on an ASP page and check whether the control works as desired.
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