c# barcode generator free Using Server Controls in Visual C#

Creator QR in Visual C# Using Server Controls

ChAPTER 4
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QR Code Scanner In Visual C#
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Using Server Controls
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Sample of C# Code protected void Page_Load(object sender, EventArgs e) { Image1.ImageUrl = "~/images/whale.jpg"; Image1.DescriptionUrl = "~/WhaleImageDescription.htm"; Image1.AlternateText = "This is a picture of a whale"; }
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The ImageButton Control
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The Image control does not have a Click event. In situations in which a Click event is necessary, you can use ImageButton or ImageMap instead. These controls allow you to treat an image like a clickable button. In addition, you can retrieve the x-coordinate and y-coordinate of the user s click. This is useful for determining where on the image the user has clicked. You can use this information on the server to perform different actions, depending on the area clicked by the user. The ImageButton control is used to display a clickable image on a webpage that can be used to perform a postback to the web server when the image is clicked. This control generates an <input type="image"> element when rendering to HTML. The ImageButton control is represented as an <asp:ImageButton> element in Source view and has no content, so you can write this element as a singleton element. As with the Image control, the ImageButton control s primary property, ImageUrl, indicates the path to an image that can be downloaded from the browser and displayed. This property maps directly to the src attribute of the <input> element in HTML. Because the ImageButton inherits from the Image control, it also contains the AlternateText, DescriptionUrl, ImageAlign, and GenerateEmptyAlternateText properties. The ImageButton control has a Click event and a Command event that function like these same events do for the Button control. The second argument of the Click event has a data type of ImageClickEventArgs, which lets you retrieve the x-coordinate and y-coordinate of the user s click. In the following example, a webpage was created and an ImageButton control was added to the page. This control uses an image that is both red and blue (redblue.jpg). The following code was added to the code-behind page to show how the ImageButton control s properties can be set programmatically and the Click event can be implemented.
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Drawing Bar Code In Visual C#.NET
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Lesson 2: Exploring Specialized Server Controls
Drawing GS1 - 12 In C#.NET
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Paint USS Code 93, USS 93 In Visual C#
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ChAPTER 4
Scanning Code-39 In Visual Basic .NET
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Printing PDF-417 2d Barcode In None
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Sample of Visual Basic Code Partial Class ImageControl Inherits System.Web.UI.Page Protected Sub Page_Load(ByVal sender As Object, _ ByVal e As System.EventArgs) Handles Me.Load ImageButton1.ImageUrl = "~/images/redblue.jpg" ImageButton1.AlternateText = _ "This is a button. The left side is red. The right is blue." End Sub Protected Sub ImageButton1_Click(ByVal sender As Object, _ ByVal e As System.Web.UI.ImageClickEventArgs) Handles ImageButton1.Click ImageButton1.AlternateText = _ String.Format("Button Clicked at {0},{1}", e.X, e.Y) End Sub End Class Sample of C# Code public partial class ImageButton_Control : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { ImageButton1.ImageUrl = "~/images/redblue.jpg"; ImageButton1.AlternateText = "This is a button. The left side is red. The right is blue."; } protected void ImageButton1_Click(object sender, ImageClickEventArgs e) { ImageButton1.AlternateText = string.Format("Button Clicked at {0},{1}", e.X, e.Y); } }
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This code sets the ImageButton control properties in the Page_Load event handler. In the ImageButton1_Click event handler, the x-coordinate and y-coordinate are retrieved and placed into the AlternateText property. In this example, you can use this information to determine the area (or color) on which the user clicked and make a decision accordingly.
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The ImageMap Control
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Making QR Code 2d Barcode In Java
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The ImageMap control is used to display a clickable image that can be used to post form information back to the web server when the image is clicked. This control differs from the ImageButton control in that the ImageMap control allows you to define regions or hot spots that cause a postback, whereas clicking anywhere on an ImageButton causes a postback. The ImageMap control generates an <img usemap="#myMap"> element in HTML. In addition, a <map name="myMap"> element with nested <area> elements is also created when the HTML is rendered.
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