Contents tagged with GridView
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Using Value Providers in ASP.NET 4.5
ASP.NET 4.5 Web Forms support model binding. A part of the overall model binding features are Value Providers. A value provider grabs values from a request and binds those values with method parameters. ASP.NET provides several inbuilt value providers and also allows you to create your own. This article discusses what value providers are with examples. It also shows how a custom value provider can be created.
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Using HTML5 Date Input Type Inside GridView
HTML5 provides several new input types such as email, URL and Date. While using Date input type a textbox is displayed as a date-picker by browsers such as Chrome and Opera. Such a textbox uses dates in yyyy-MM-dd format (ISO format) and this formatting can lead to some problems in data controls such as GridView as discussed below.
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Validating Multiple Data Model Properties
In my previous article I wrote about displaying model state errors inside databound controls such as GridView. In that example we used data annotation validators to perform the validations. While data annotation validators do their job quite well they are inherently applied to only one data model property at a time. For example, the [StringLength] or [Required] attributes validate only one property under consideration. However, sometimes your validation rule involves multiple data model properties. In such cases data annotation validators won’t be of much use. Luckily there are other validation techniques that can come to your rescue.
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Displaying Model State Errors Inside GridView Columns
ASP.NET 4.5 web forms support model binding features. Additionally they can make use of model validation using data annotation validators. The validation errors thrown by data annotation validators can be easily displayed in a web form using ValiationSummary control. While this arrangement works great, at times you want something customized. This article shows how model errors can be displayed inside a GridView column. You can use similar technique for other databound controls such as DetailsView and FormView.
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GridView Paging with Skip() and Take()
Paging is one of the most commonly used features of ASP.NET GridView control. ASP.NET 4.5 model binding features allow you to bind a GridView with data returned by a custom method. This method is specified using the SelectMethod property and can make use of LINQ and Entity Framework to fetch data. Additionally, it allows you to implement custom paging. This article shows how.
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Select, Zip and Download Files displayed in a GridView
Sometime back I wrote an article that shows how to zip and unzip files programmatically using System.IO.Compression classes. Using these classes along with ASP.NET controls you can allow user user to select one or more files from a list and then programmatically "bundle" these files into a ZIP archive. This short post shows how.
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Edit GridView data without displaying default Edit, Update and Cancel buttons
ASP.NET GridView control provides an easy way to edit and update data with the help of CommandField column type. The default CommandField arrangement is such that the Edit, Update and Cancel buttons are displayed in a column. The problem with this design is that the GridView edit column always occupies some screen real estate. Additionally in the edit mode the GridView expands horizontally disturbing the page layout. Luckily, with some easy trick you can render an editable GridView without displaying the default Edit, Update and Cancel buttons. This post shows how.
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Convert GridView Data to CSV using jQuery
At times you may want to allow the end user to save GridView data into CSV format for further processing (say for opening later in Excel). Doing so using server side code is quite common. However, this requires an extra round trip to the server. You can also convert data from a GridView into CSV using jQuery. This post shows how.