Programming Ezine

ASP.Net HiddenField OnValueChanged Event

top54u.com — Fri, 06 Nov 2009 07:35:35

The OnValueChanged Event of ASP.Net HiddenField control is raised when its value changes while postback event of web form submission to the server. You can attach the ValueChanged server side event handler for the hiddenfield control to perform a custom routine when its value changes at the time of posts to the server.

Working with ASP.Net HiddenField Control

top54u.com — Fri, 06 Nov 2009 07:23:00

The ASP.Net HiddenField Control enables you to store the page specific information that you don't want to display on the web page. It stores the data in hidden mode and persists its availability even across the postbacks to the server.

HiddenField Control in ASP.Net

top54u.com — Fri, 06 Nov 2009 07:11:00

The ASP.Net HiddenField Control provides the functionality to store the values without displaying them on the web page. It enables you to store the information that needs to be persisted across the post backs to the server without losing the data. The HiddenField control in ASP.Net rendered as an HTML input field as hidden type

ASP.Net FileUpload File type filter Validation using C# code

top54u.com — Fri, 30 Oct 2009 07:17:18

The ASP.Net FileUpload control does not provide any in-built method to customize the file type filter dropdown of file-navigation dialog box to a specific file type. Like we applied JavaScript Code in the previous tutorial here we will create the similar server side code using C#.

ASP.Net FileUpload File Type Filter using JavaScript Validation

top54u.com — Fri, 30 Oct 2009 07:10:00

The ASP.Net FileUpload control does not have any property to provide the functionality to filter the valid/invalid file types in the file-navigation dialog box that opens when user clicks the browse button of fileupload control. You can implement the File Type filter for FileUpload control using JavaScript client side code.

ASP.Net FileUpload Size Limit Example

top54u.com — Fri, 30 Oct 2009 06:51:00

The File size limit validation is required for ASP.Net FileUpload control as a security feature to protect the web server being dominated by the spammers by uploading large files that kill the server cache available for loading the web pages hosted on it. The FileUpload control does not provide any in-built controlled way for applying the limit over the file size

ASP.Net File Upload Example using C# code

top54u.com — Fri, 30 Oct 2009 06:32:00

In the previous tutorial: ASP.Net FileUpload Control PostedFile property we learnt about its accessible member properties and method. As it provides the object of HttpPostedFile class it points the memory stream of the uploaded file stored in the cache area of server memory. You can access different attributes of the uploaded file

ASP.Net FileUpload PostedFile Property

top54u.com — Fri, 30 Oct 2009 06:17:00

The PostedFile property of ASP.Net FileUpload control provides an object of HttpPostedFile class that points to the file uploaded by the control. The FileUpload control does not starts the file caching on the server automatically it need a specific code to upload the file and save it on the web server hard disk.

ASP.Net FileUpload Control

top54u.com — Fri, 30 Oct 2009 06:13:00

The ASP.Net FileUpload control is new web server control in ASP.Net 2.0 framework that provides the advanced functionality to the users to send a file from their computer system to the online web server. It renders using HTML input type file control that appears as combination of two controls such as TextBox control and a Button control.

ASP.Net DropDownList XML DataSource Databinding

top54u.com — Thu, 29 Oct 2009 01:51:00

The ASP.Net DropDownList control also supports the XML databinding that allows you to display the list items retrieved from the data saved in the form of XML file. There are number of ways to read the data from XML file for example using XmlDocument class. Using the XmlDocument class object you can fetch the data from an XML file having any type format for storing the xml data.

ASP.Net DropDownList DataTextField Multiple Columns

top54u.com — Thu, 29 Oct 2009 01:38:00

Is it really possible to specify the multiple column names to the DataTextField property of ASP.Net DropDownList control? As per the definition of DataTextField property it is meant for single data field only. You can also verify according to the naming standards that the property name denotes

ASP.Net DropDownList Validation using JavaScript

top54u.com — Thu, 29 Oct 2009 01:28:00

You can also validate the selected value of ASP.Net DropDownList control using JavaScript client side function by calling it when user clicks the list item of dropdownlist control to select it. The JavaScript validation function executes at the click event of DropDownList control that occurs at client side and executes the client side script before sending the ASP.Net web page to post back.

ASP.Net C# DropDownList SelectedIndex Property

top54u.com — Wed, 28 Oct 2009 05:40:00

The SelectedIndex property of ASP.Net DropDownList control enables you to get or set the zero-based index of the selected list item dynamically using C# code. When user clicks on any list item of dropdownlist control it fires the OnSelectedIndexChanged event that can be handled at server side to get the index of the list item clicked by the user.

ASP.Net C# DropDownList SelectedValue Property

top54u.com — Wed, 28 Oct 2009 05:29:00

The SelectedValue property of ASP.Net DropDownList control enables you to get or set the value of selected list item dynamically using C# code. When user clicks on any list item of dropdownlist control it fires the OnSelectedIndexChanged event that can be handled at server side

Setting ASP.Net DropDownList Default Value

top54u.com — Wed, 28 Oct 2009 05:24:00

There are number of ways to set the Default value for ASP.Net DropDownList control that allow you to display its list item appear as selected item by default. It depends upon your requirement to display which item dropdownlist control appear as default value. There are three types of situations to apply the same functionality