Synapseindia DOTNET Development Part 1

8/10/2019 Synapseindia DOTNET Development Part 1

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ASP.NET Tips and Tricks


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What we will cover

Development Tips and Tricks

Error HandlingTips and Tricks

Production Tips and Tricks


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Session Prerequisites

ASP Basic knowledge of ASP.NET


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Agenda

Development Tips and Tricks

Error Handling Tips and Tricks

Production Tips and Tricks


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Development Tips And Tricks

ASP.NET provides built-in file upload support No posting acceptor required

No third party components required

Accessible through two APIs: Request.Files collection server control

HttpPostedFileObject:

HttpPostedFile.InputStream HttpPostedFile.ContentType

HttpPostedFile.FileName

HttpPostedFile.SaveAs(fileLocation)


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Sub Btn_Click(Sender as Object, E as EventArgs)

UploadFile.PostedFile.SaveAs("c:\foo.txt")

End Sub

Select File To Upload:


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Demonstration 1File Upload


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File system is not the only option

Example: Storing within SQL

Access uploaded file as bytearray

Store file within SQL as image (blob)

Store ContentTypeand ContentLengthalso

Provide Edit Link to display page

Edit Link Page sets ContentTypeheader and thenwrites binary array back to client



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Demonstration 2File Upload With SQL


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Rich server image generation

Additionally supports resizing & cropping

Overlays on top of existing images

Read/Write Any Standard IO Stream

System.Drawing

Dynamically generate GIFs/JPGs from .aspx Set ContentTypeappropriately

Optionally output cache results



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Demonstration 3Image Generation


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ASP.NET

Enables output of XML

Enables optional XSL/T transform of XML

Binding options

File system

Database item

Built-in caching

Ensure efficient re-use

Improves performance

Development Tips And TricksASP.NET XML Server Control


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file sample


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Demonstration 4Static XML


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Sub Page_Load(Sender as Object, E as EventArgs)Dim conn as New SqlConnection(connectionString)

Dim cmd as New SqlDataAdapter(select * from products",

conn)

Dim dataset As New DataSet()

cmd.Fill (dataset, "dataset")

Dim XmlDoc as XmlDocument = New XmlDataDocument(dataset)

MyXml1.Document = XmlDoc

End Sub


data sample


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Demonstration 5Dynamically Bind XML


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Application specific settings

Stored in web.configfiles

Enables devs to avoid hard-coding them

Administrators can later change them

Examples:

Database Connection String MSMQ Queue Servers

File Locations

Development Tips And TricksApp settings


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1. Create web.config file in app vroot:

To return value:

Configuration.AppSettings(dsn)

Development Tips And TricksApp settings steps

Documents

Synapseindia DOTNET Development Part 1