Controls in asp.net
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Transcript of Controls in asp.net
![Page 1: Controls in asp.net](https://reader033.fdocuments.net/reader033/viewer/2022061305/5499a54fb47959ab6e8b45d8/html5/thumbnails/1.jpg)
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ASP.NET CONTROLS
![Page 3: Controls in asp.net](https://reader033.fdocuments.net/reader033/viewer/2022061305/5499a54fb47959ab6e8b45d8/html5/thumbnails/3.jpg)
controls
• Controls are the building blocks in web form• Server controls are tags that are understood
by the server.
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Asp.net controls
server control
Html server control
Webserver control
Validation server control
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Html server control
• HTML server controls are HTML tags understood by the server
• All HTML server controls must be within a <form> tag with the runat="server" attribute.
• The runat="server" attribute indicates that the form should be processed on the server.
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Html server controls in asp.net Html server controls Description
Controls an <a> HTML element
HtmlButton Controls a <button> HTML element
HtmlInputButton Controls <input type="button">, <input type="submit">, and <input type="reset"> HTML elements
HtmlInputCheckBox Controls an <input type="checkbox"> HTML element
HtmlInputRadioButton Controls an <input type="radio"> HTML element
HtmlTextArea Controls a <textarea> HTML element
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Example
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<html><body><form runat="server"><input id="Text1" type="text" /></form></body></html>
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Web server control
• Web server controls are special ASP.NET tags understood by the server
• Web server controls are also created on the server and they require a runat="server" attribute to work.
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Webserver control Description
AdRotator Displays a sequence of images
Button Displays a push button
BulletedList Creates a list in bullet format
Repeater Displays a repeated list of items bound to the control
HyperLink Creates a hyperlink
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Example
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<html><body><form runat="server"><asp:Button id="button1" Text="Click me!"runat="server" OnClick="submit"/></form></body></html>
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Validation server control
• Validation server controls are used to validate user-input. If the user-input does not pass validation, it will display an error message to the user.
• Each validation control performs a specific type of validation (like validating against a specific value or a range of values).
• By default, page validation is performed when a Button, is clicked. You can prevent validation when a button control is clicked by setting the CausesValidation property to false
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Validation Server Control Description
CompareValidator Compares the value of one input control to the value of another input control or to a fixed value
CustomValidator Allows you to write a method to handle the validation of the value entered
RangeValidator Checks that the user enters a value that falls between two values
RegularExpressionValidator Ensures that the value of an input control matches a specified pattern
RequiredFieldValidator Makes an input control a required field
ValidationSummary Displays a report of all validation errors occurred in a Web page
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Example
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<html><body><form runat="server"><p>Enter a number from 1 to 100:<asp:TextBox id="tbox1" runat="server" /><br /><br /><asp:Button Text="Submit" runat="server" /><asp:RangeValidatorControlToValidate="tbox1"MinimumValue="1"MaximumValue="100"Type="Integer"Text="The value must be from 1 to 100!"runat="server" /></form></body></html>
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Difference between server controland html control
Asp.net server control: retain state Html control: does not retain state
Example
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