how to generate barcode in asp.net using c# Building the Web Forms User Control in Font

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Building the Web Forms User Control
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Once the new project is created in Visual Studio .NET, you should have a new Web Forms User Control open. Using the design surface, add a TreeView control to display information and a Label control to display any error messages. Before you can add the TreeView control, however, you ll have to retrieve it from the Internet Explorer Web Controls assembly.
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Follow these steps to add controls to the design surface: 1. In Visual Studio .NET, right-click the Toolbox and select Add/Remove Items from the context menu. 2. In the Customize Toolbox dialog, click the Browse button and locate the TreeView control associated with the assembly IEWebControls.dll. 3. Click the OK button to add the TreeView control to the Toolbox. 4. Drag a Label control from the Toolbox to the design surface. 5. Press the Enter key to start a new line and drag a TreeView control from the Toolbox to the design surface.
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Coding the Web Forms User Control
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Once the controls are added to the design surface, then you can code the control. In this example, simply return all of the lists on the host site and display them in the tree. Add the code from Listing 3-11 to create the tree. Listing 3-11. Populating the Tree namespace { using using using using using using using using using using using SiteLists System; System.Data; System.Drawing; System.Web; System.Web.UI.WebControls; System.Web.UI.HtmlControls; Microsoft.SharePoint; Microsoft.SharePoint.Utilities; Microsoft.SharePoint.WebPartPages; Microsoft.SharePoint.WebControls; Microsoft.Web.UI.WebControls;
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public class WebUserControl1 : System.Web.UI.UserControl { protected System.Web.UI.WebControls.Label Label1; protected Microsoft.Web.UI.WebControls.TreeView TreeView1; private void Page_Load(object sender, System.EventArgs e) { try { //get this web Label1.Text = ""; SPSite site = SPControl.GetContextSite(Context); SPWeb web = site.OpenWeb();
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//add tree root TreeNode root = new TreeNode(); root.Text = web.Title; root.ImageUrl = "/_layouts/images/globe.gif"; root.Expanded = true; TreeView1.Nodes.Clear(); TreeView1.Nodes.Add(root); //add documents node TreeNode docs = new TreeNode(); docs.Text = "Libraries"; docs.ImageUrl = "/_layouts/images/folder16.gif"; root.Nodes.Add(docs); //add tasks node TreeNode tasks = new TreeNode(); tasks.Text = "Task Lists"; tasks.ImageUrl = "/_layouts/images/taskpane.gif"; root.Nodes.Add(tasks); //add others node TreeNode others = new TreeNode(); others.Text = "Other Lists"; others.ImageUrl = ""; root.Nodes.Add(others); //add lists to the tree SPListCollection lists = web.Lists; foreach (SPList list in lists) { TreeNode node = new TreeNode(); switch(list.BaseTemplate) { case SPListTemplateType.DocumentLibrary: node.Text = list.Title; node.ImageUrl = "/_layouts/images/doc16.gif"; node.NavigateUrl = list.DefaultViewUrl; docs.Nodes.Add(node); break; case SPListTemplateType.Tasks: node.Text = list.Title; node.ImageUrl = "/_layouts/images/check.gif"; node.NavigateUrl = list.DefaultViewUrl; tasks.Nodes.Add(node); break;
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default: node.Text = list.Title; node.ImageUrl = "/_layouts/images/list.gif"; node.NavigateUrl = list.DefaultViewUrl; others.Nodes.Add(node); break; } } } catch(Exception x) { Label1.Text = x.Message; } } } }
Building the Host Web Part
After the user interface is completed, you must create a web part to host the Web Forms User Control. This is accomplished by adding a new web part project to the solution and referencing the Web Forms User Control. Once the project is created, you will then write the code to load the user interface. Follow these steps to create the host web part: 1. In Visual Studio .NET, select File Add Project New Project from the main menu. 2. In the Add New Project dialog, open the Visual C# Projects folder and select to create a new Web Part Library project. 3. Name the new project SiteListsHost and click the OK button. 4. When the new project is created, select Project Add Reference from the main menu. 5. In the Add Reference dialog, select the Projects tab. 6. On the Projects tab, select to add a reference to the SiteLists project and click the OK button. 7. Change the name of the file WebPart1.dwp to Container.dwp. 8. Open Container.dwp for editing and change the contents to appear like the following: < xml version="1.0" encoding="utf-8" > <WebPart xmlns="http://schemas.microsoft.com/WebPart/v2" > <Title>Site Lists Host Web Part</Title> <Description>A host for the Site Lists</Description> <Assembly>SiteListsHost</Assembly> <TypeName>SiteListsHost.Container</TypeName> <!-- Specify initial values for any additional base class or custom properties here. --> </WebPart>
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