Skip to main content

All server controls must appear within a form tag, and the form tag must contain the runat='server' attribute.


ASP.NET Web Forms

All server controls must appear within a <form> tag, and the <form> tag must contain the runat="server" attribute. The runat="server" attribute indicates that the form should be processed on the server. It also indicates that the enclosed controls can be accessed by server scripts:
<form runat="server">

...HTML + server controls

</form>
Note: The form is always submitted to the page itself. If you specify an action attribute, it is ignored. If you omit the method attribute, it will be set to method="post" by default. Also, if you do not specify the name and id attributes, they are automatically assigned by ASP.NET.
Note: An .aspx page can only contain ONE <form runat="server"> control!
If you select view source in an .aspx page containing a form with no name, method, action, or id attribute specified, you will see that ASP.NET has added these attributes to the form. It looks something like this:
<form name="_ctl0" method="post" action="page.aspx" id="_ctl0">

...some code

</form>

Submitting a Form

A form is most often submitted by clicking on a button. The Button server control in ASP.NET has the following format:
<asp:Button id="id" text="label" OnClick="sub" runat="server" />
The id attribute defines a unique name for the button and the text attribute assigns a label to the button. The onClick event handler specifies a named subroutine to execute.
In the following example we declare a Button control in an .aspx file. A button click runs a subroutine which changes the text on the button:

Comments

Post a Comment

Popular posts from this blog

ASP.NET MVC - Set custom IIdentity or IPrincipal

Here's how I do it. I decided to use IPrincipal instead of IIdentity because it means I don't have to implement both IIdentity and IPrincipal. Create the interface interface ICustomPrincipal : IPrincipal { int UserId { get ; set ; } string FirstName { get ; set ; } string LastName { get ; set ; } } CustomPrincipal public class CustomPrincipal : ICustomPrincipal { public IIdentity Identity { get ; private set ; } public bool IsInRole ( string role ) { return false ; } public CustomPrincipal ( string email ) { this . Identity = new GenericIdentity ( email ); } public int UserId { get ; set ; } public string FirstName { get ; set ; } public string LastName { get ; set ; } } CustomPrincipalSerializeModel - for serializing custom information into userdata field in FormsAuthenticationTicket object. public class CustomPrincipalSerializeMode...
8 comments
Read more

Validate credit card number with Mod 10 algorithm in C#

Introduction All you know what information contains in your NIC number. But do you know what information contains in the Credit Card Number? Following article provides brief details about what information contain in your credit card and demonstrates to how to validate credit card number using mod 10 (Luhn) algorithms with C#. Background  Card Length   Typically, credit card numbers are all numeric and the length of the credit card number is between 12 digits to 19 digits.  14, 15, 16 digits – Diners Club 15 digits – American Express 13, 16 digits – Visa 16 digits - MasterCard   For more information please refer  http://en.wikipedia.org/wiki/Bank_card_number . Hidden information  Major Industry Identifier (MII)   The first digit of the credit card number is the Major Industry Identifier (MII). It designates the category of the entry which issued the card.     1 and 2 – Airlin...
1 comment
Read more

Web Services Description Language Tool (Wsdl.exe)

Ref:  https://msdn.microsoft.com/en-us/library/7h3ystb6(VS.80).aspx The Web Services Description Language tool generates code for XML Web services and XML Web service clients from WSDL contract files, XSD schemas, and .discomap discovery documents. wsdl [options] {URL | path} Argument Description URL The URL to a WSDL contract file (.wsdl), XSD schema file (.xsd), or discovery document (.disco). Note that you cannot specify a URL to a .discomap discovery document. Path The path to a local WSDL contract file (.wsdl), XSD schema file (.xsd), or discovery document (.disco or .discomap). Option Description /appsettingurlkey: key or /urlkey: key Specifies the configuration key to use in order to read the default value for the URL property when generating code. When using the   /parameters   option, this value is the   <appSettingUrlKey>   element and contains a string. /appsettingbaseurl: baseurl or /baseurl:...
Post a Comment
Read more