Work with data in ASP.NET

Developing Windows and Web Applications using Visual Studio.NETEric PhanSolution Architect

Credit Card Validationhttp://sharepoint.ssw.com.au/Training/UTSNET/Part 2: .NET WebformsOverview of .NET WebformsData in Webforms TODAYUsabilityRich Web Forms and Other ASP.NET Features Web Security Advanced Topics & Future Technology (Silverlight)Webforms

Session 7: Data in the WebGoal: Bringing data to the weband back :-)

Input ValidationData in our database

Bring database to the webShow/viewDataEnter

What is ADO.NET? Set of classes that expose data access services to the .NET programmerADO.NET provides a rich set of components for creating distributed, data-sharing applicationsIt is an integral part of the .NET Framework, providing access to relational data, XML, and application data

WebForm AppsWinForm AppsADO.NETDataSetsSQLConnectionSQLCommandSQLDataAdapterSQLDataReaderSQL Data ProvidersSQL DataXML DataOracle Data…

ObjectsInstead of DataSets we use classesExtensibleCan embed logic and validationA more OO approach

WebForm AppsWinForm AppsObjects/EntitiesData SourcesSQL DataXML DataOracle Data…

DataSets or Business ObjectsWhy use DataSetsA highly functional container for data that can be strongly typedAutomatic change tracking for contained dataSeamless data-binding supportWhy Use ObjectsBusiness Objects (NHibernate, NTiers, LINQ to SQL, LINQ to Entities)Light weightGood data-binding supportExtensible and OOVery easy to useNo SQL command Strings

The new way!LINQ 2 EntitiesLINQ 2 SQL

LINQ to SQL/EntitiesBrand new in the .NET 3.5 FrameworkEasily access and query your database through classesLogical access to class hierarchiesSupports InheritanceIntuitive to use

DBML FileDatabase Mapping LanguageContains a mapping of classes to database tablesHas built in logic to handle selection, updates and deletesCan be customizedwww.hookedonlinq.com

var customers = from c in db.Customers where c.FirstName.StartsWith(“A”) select cSQL Syntax

var customers = db.Customers.Where(c => c.FirstName.StartsWith(“A”);Lambda Syntax

Challenge, use this instead of SQL Server Management Studio for a monthLINQPad

See our Ruleshttp://www.ssw.com.au/ssw/Standards/Rules/RulesToBetterLINQ.aspx

Data BindingDataData sourceFrom MSDN: Data binding is the process that establishes connection between the application UI and business logicBinding controls to data from databaseBind a grid on Webform to a database tableSimple, convenient, and powerful way to create a read/write link between the controls on a form and the data in their application

Databinding the GridView (code)C#NorthwindDataContext db = newNorthwindDataContext();GridView1.DataSource = db.Customers;GridView1.DataBind();English Instantiate our data access classMake the datasource of GridView1 all the customers from our databaseBind the Grid

Databinding the GridView (designer)

Databinding the GridView (running)

Display a Table from a Database

Without writing any code at allGridViewLots of built in features like:SortingPagingInsertingUpdating DeletingSelecting

Enabling these featuresEnable Delete, Insert, Update on the DataSource

Enabling these featuresEnable them on the GridView

Other Data Bindable Web ControlsBindable to Lists DataListDetailsViewFormViewRepeater/ListViewDropDownListListBoxCheckBoxListRadioButtonListBindable to Properties/ColumnsMost other controls

Data-Bound ControlsMost controls in .NET Framework support data bindingControls inherit from the WebControl base classwhich implements IDataBindingsAccessorinterfaceImportant Data-binding properties DataSourceDataMemberDisplayMemberValueMemberDesign your own controls or purchase 3rd party controls

Passing Parameters between pagesPass parameters to pages or controlsPass parameters to our data sourcesParameters can be obtained from:Query StringSession VariableControl PropertyHidden FieldCookie

1. Create a CustomerDetails.aspx Add a Details View and create a new Datasource

4. Make it read from the Query String

5. Change the Select on the GridView to Link to the CustomerDetails Page

7. Delete Select and Add a Hyperlink

8. Configure the HyperlinkCustomerDetails.aspx?CustomerID={0}

Validation – Don’t trust anyone

Validation - Bring database to the webShow/viewDataEnter

ValidationWhy do we need it?PEBCACBad Data

Why use Validations?Seamless verification of data fieldsCheck for mandatory fieldsCheck for correct data formatsCheck for data rangesReduces incorrect data entered into your databasePrevent possible runtime exceptions

Validation TypesClientShow/viewDataEnterClientServer

Validation TypesClient-Side ValidationValidations are performed before the form is posted backQuick and responsive for the end userInsecureServer-Side ValidationValidation checks are performed on the serverSecure because these checks cannot be easily by passedSometimes can be slowRecommendationUse both the typesThis approach provides the best of both worldsClientShow/viewDataEnterClientServer

ASP.NET Validation Server ControlsRequiredFieldValidatorCompareValidatorRangeValidatorRegularExpressionValidatorCustomValidatorValidationSummary

To put the Northwind database up on the web?CRUD for all tablesPages for all tablesValidation So how long do you think it would take...

Work with data in ASP.NET

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