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Show Uploaded Image in Image Control in Asp.net

2009-08-13T06:09:00.001-07:00

Background:

Many a times we come across with the requirement to show uploaded file information in Grid View or in some other control or display uploaded image file in Image control. There is various way of doing it you can either do this on client side or do it on server side. You can either create physical folder to store file or in a database or store it in stream, should always choose better option.

Introduction

In this article I am focusing on generating image on server side by converting posted file content in binary format, then storing it in session so that it can be accessed in Image.aspx for generating image.

Below are steps to execute in order to generate expected output.

1. Create a form with Image control, File Upload control and Upload Button (Sample.aspx)

2. Create another form called Image.aspx which will generate uploaded Image and display it in image control.(Image.aspx)

3. On Click of Upload button write following code.(Sample.aspx)

protected void btnUpload_Click(object sender, EventArgs e)

{

string imgFileName ="";//variable to store image file name.

//Below checking wehter user has selected image file or not.

if (FileuploadControl1.FileName.Length == 0)

{

ScriptManager.RegisterClientScriptBlock(Page, Page.GetType(), "Message1", "alert('Provide Image File')", true);

return;//If no file is selected by user then show appropriate message with the help of javascript.I have used Ajax ScriptManager for this.

}

else

{

imgFileName = FileuploadControl1.FileName;//storing image file name.

if ((System.IO.Path.GetExtension(imgFileName) == ".jpg") || (System.IO.Path.GetExtension(imgFileName) == ".jpeg") || (System.IO.Path.GetExtension(imgFileName) == ".bmp") || (System.IO.Path.GetExtension(imgFileName) == ".gif") || (System.IO.Path.GetExtension(imgFileName) == ".ico") || (System.IO.Path.GetExtension(imgFileName) == ".png"))

{ //Checking for image file extensions.

byte []img;//To store image file

//HttpPostedFile class belong to System.web namespace provide access to the files uploaded by users

HttpPostedFile postFile = FileuploadControl1.PostedFile;

//stores upladed file information

int contentLength = postFile.ContentLength;//Storing file length

img = new byte[contentLength];//Initializing byte variable by passing image content length.

postFile.InputStream.Read(img, 0, contentLength); //Reading byte content

DataTable dtTemp = new DataTable("TempImage");//Creating temprory data table which will store image information

dtTemp.Columns.Add("Image",System.Type.GetType("System.Byte[]"));//Byte Image column

DataRow dr = dtTemp.NewRow();

dr[0] = img;//storing binary image information in table.

dtTemp.Rows.Add(dr);

Session["dt"] = dtTemp;//storing temprory table in seesion.

ImageControl.ImageUrl = "Image.aspx?id=0"; //Query string id we have passed

in order to generate new request everytime.

}

else

{

//If user has selected file other than image then show appropriate java script message.

ScriptManager.RegisterClientScriptBlock(Page, Page.GetType(), "Message2", "alert('Provide only Image File'", true);

return;

}

After writing above code in Sample.aspx we will write some snippet in Image.aspx which will generate uploaded image.

Image.aspx

protected void Page_Load(object sender, EventArgs e)

{

//On Page Load we are reading data stored in session.

DataTable dt = new DataTable();

dt = (DataTable)Session["dt"];

byte[] b = null;

int id =Convert.ToInt16(Request.QueryString["id"]); //Fetching query string Id.

If(dt.Rows.Count > 0)

{

//storing image binary information in byte array variable.

b = ((byte[])dt.Rows[0][“Image”]);

}

if (b != null)

{

//setting content type.

Response.ContentType = "image/jpeg";

//writes binary array with binary write

Response.BinaryWrite(b);

}

Summary:

Here we have looked how to generate image uploaded from fileupload control we have used Response.BinaryWrite() Method for this you can also use Response.OutputStream.Write (b, 0, b.Length) for generating image.

2009-06-17T06:05:00.000-07:00

Hello Friends,

In this article I will share with you small useful code snippet.

Consider a scenario where you want to change the theme of the site which is total css based.So if you want to change the css dynamically you can use following code snippet.

1. Create Object of HtmlLink class.

System.Web.UI.HtmlControls.HtmlLink mycss = new System.Web.UI.HtmlControls.HtmlLink();

2. Change css as per drop down list selection.

string str=ddlTheme.SelectedValue.ToString();

//Drop down list contains theme name and css location.

3.Specify the path of the CSS.

mycss.Href = Server.MapPath(str);//Map the path for css.

4.Add attribute to css.

mycss.Attributes.Add("rel", "stylesheet");

mycss.Attributes.Add("type", "text/css");

5.Add CSS in page header as follow.

Page.Header.Controls.Add(mycss);

Advantages of Windows Azure

2009-02-07T01:18:00.000-08:00

In Short windows Azure is dedicated OS for Cloud Computing,which can manage web application and services on the internet in Microsoft Data Center. Developer can develop cloud application and host it on windows azure platform.For that you require windows Live ID.You can host it on following link:http://www.microsoft.com/azure/signin.mspx

For Developing cloud application at developer end you need to follow some pre requisite.

Need to install following software for developing cloud application.

Pre-Requisite:

1.Windows Vista SP1 or Windows Server 2008 (32 and 64 both).

2..Net Framework 3.5 SP1.

3.IIS 7.0 with ASP.Net and WCF HTTP Activation.

4.Microsoft SQL Express Server 2005 or 2008

5.Windows Azure SDK.

6.Windows Azure trust level.( http://msdn.microsoft.com/en-us/library/dd179369.aspx)

7.VS 2008

Advantages of Windows Azure.

Windows Azure is flexible,reliable ,interoperable,secure.Windows Azure provide open standard environment with the support of different protocols, HTTP,REST,SOAP and XML.Also provide live services,.net service,Sql Services, Sharepoint and Dynamics CRM services.Developer can integrate thsese services while developing cloude application.

ü Scalability by design. Applications and services run in multiple servers and processors which are transparent for us.Automatic Load balancing.We need to provide only number of instances for load balancing.

ü High availability. 24 x 7 availability.

ü Security. The platform is thought to be secured and manage different levels of authentication.

ü Updating. Microsoft is going to manage updates and keep their systems up to date.

ü Visual Studio Integration. This allows us to work with Visual Studio and have new Project templates, deploy solutions easily, manage configurations, debug (during development phase) etc.In future developer can develop cloud application in non .net languages using same environment.

Compute, Store and Manage Application with Windows Azure

2009-01-16T23:15:00.001-08:00

Hello friends I am doing R&D on Windows Azure which is purely implementing cloud computing by providing separate OS that is totally dedicated to Cloud.I would like to share some information about it.
What is Windows Azure?
Windows Azure is windows like environment developed by Microsoft for Cloud Computing. It is an integrated, dedicated operating system at Microsoft data centers to cater to VM used deploying cloud application Service. It is base for window Azure Service Platform as its core windows server 2008 with Hyper V to make it scalable. Developer can develop cloud application in their working place and host service on Azure Service platform located at Microsoft Datacenter. It is basically used for hosting services and mass storage .Several users can access it from different device but from same physical instance.

What is Azure Service Platform?
Windows Azure Service platform is hosted on Microsoft Data Center which provides OS and set of developer services. It includes .NET services, SQL Data Service, Live Services, Share point service, Dynamic CRM service. Service platform support multiple internet protocol including HTTP, REST, SOAP, XML.
Key Features
1.All azure application runs within Microsoft Data center accessible via internet.
2.It has simple service architecture.
3.Automated Service Management.
4.Storage: BLOB, Tables and Queue.
5.Azure support background processes that run independent from web application
6.Each Azure application has its own configuration file that dictates how much resources it should consume within the platform.
7.Azure has a complete online browser portal to control all aspects of their Azure application.
8.Azure application run’s in their own instance.
9.Azure application can determine how many instance they want to run on and platform will automatically load balanced between the two.
10.Each "instance" is effectively a Windows 64bit Server 2008 running .NET 3.5

What is Windows Azure?

2009-01-16T23:15:00.000-08:00

Hello friends
Now a days we are hereing about cloud computing a lot where microsoft also came in the race of cloud computing. So I have done some R&D on windows Azure and I would like to share that information with you people.

What is Windows Azure?
Windows Azure is windows like environment developed by Microsoft for Cloud Computing. It is an integrated, dedicated operating system at Microsoft data centers to cater to VM used deploying cloud application Service. It is base for window Azure Service Platform as its core windows server 2008 with Hyper V to make it scalable. Developer can develop cloud application in their working place and host service on Azure Service platform located at Microsoft Datacenter. It is basically used for hosting services and mass storage .Several users can access it from different device but from same physical instance.
What is Azure Service Platform?
Windows Azure Service platform is hosted on Microsoft Data Center which provides OS and set of developer services. It includes .NET services, SQL Data Service, Live Services, Share point service, Dynamic CRM service. Service platform support multiple internet protocol including HTTP, REST, SOAP, XML.

Key Features
1.All azure application runs within Microsoft Data center accessible via internet.
2.It has simple service architecture.
3.Automated Service Management.
4.Storage: BLOB, Tables and Queue.
5.Azure support background processes that run independent from web application
6.Each Azure application has its own configuration file that dictates how much resources it should consume within the platform.
7.Azure has a complete online browser portal to control all aspects of their Azure application.
8.Azure application run’s in their own instance.
9.Azure application can determine how many instance they want to run on and platform will automatically load balanced between the two.
10.Each "instance" is effectively a Windows 64bit Server 2008 running .NET 3.5

Cloud Computing - Emerging Computing Paradigm

2009-01-01T22:30:00.000-08:00

Hello friends I am doing R&D on Cloud Computing and I would like to share some information about cloud computing. I am also doing R&D on different providers who are providing service of Cloud.While discussing you will come accross with different providers and their strategy of implementing cloud.

The term Cloud Computing appears in 21st century but it popularly known as SAAS. Cloud computing is bring to users by various provider including Amazon,Google,Salesforce,VMware and traditional providers including Microsoft,IBM,Sun Microsystem etc. Cloud Computing becoming more and more popular, large organizations are likely to setup their own cloud.

Description:

Cloud Computing is service centric.Where data stored on cloud including software and services which can be accessed via browser.It uses standard protocols for communication.It can be accessible from any device.

Characteristics of Cloud Computing:

1. Multi-tenancy: Sharing resources between large numbers of users.

2. Virtual: Physical location is transparent to user.

3. Centralization: save cost of infrastructure.

4. Scalability: Able to break complex workload into pieces to be served incrementlly expandable infrastructure.

5. Data Access and Management

6. Monitoring and System Management

7. Reliability, Security

Types of Cloud and Concept:

Vertical Cloud: Utilizing cloud computing in particular vertical. I.e. Application or Industry.

Private Cloud: Cloud like environment within the demarcation of particular organization for its usage.

Internal Cloud: Cloud like environment within the demarcation of particular organization, available for use by said organization.

External Cloud: Environment i.e. external to the boundaries of the organization.

Public Cloud: Open environment for general public. E.g. Amazon.

Hybrid Cloud: Providing both internal and external computing environment.

Virtual Private Cloud (VPC): Turning public cloud in virtual private cloud in terms of security.

Cloud ware: generally means building, deploying, running or managing in Cloud environment.

Cloud Provider: Make cloud environment available for other. Name mentioned above.

Cloud Enabler: i.e. Vendor

Cloud Service Architecture: The term describes an architecture in which applications and application components act as services on the cloud, which serve other applications within the same cloud environment. - By Jeff Barr, chief evangelist at Amazon Web Services.

Cloudburst: Failure of cloud environment due to spike in demand or Deployment of software application that runs on internal organizational compute resource to public cloud to cater spike in demand

Different providers are having different strategies of implementing cloud computing.Microsoft providing Windows Azure,Amazon providing EC2, Salesforce providing Force.com

Best Team Bill Gates and Paul Allen

2008-11-06T02:30:00.000-08:00

Hi friends,

Team work is very intrinsic word as per as IT developers are concerned. As per as my knowledge is concerned I believe –

“Team is not the group of people; it is co-operative unit come together to share responsibility to achieve common goal and interests.” –Shweta Kulkarni

Best Example of Team work is Bill Gates, Paul Allen. They had brought the term into reality.

They not only gave powerful meaning to the term of “ team work” but also continuously proved it by achieving their common goal and shown to the world that if you will work together as a team you will reach to the target soon rather than working individually. Because one person cannot create a team. There should be practical step on, on the member’s activity along with team lead. Team success is not only depend on individual‘s success but depend on the thinking of team towards achieving the success for common goal. Team member and team leader should never forget that progress of team will be the progress of all. Team leader is not for bossing but to drive the all team members towards goal. Team members are not to pull leg of others rather than be together to beat the challengers.

“Together means making base stronger for new innovations” – Shweta D.Kulkarni.Hi friends,

Team work is very intrinsic word as per as IT developers are concerned. As per as my knowledge is concerned I believe –

“Team is not the group of people; it is co-operative unit come together to share responsibility to achieve common goal and interests.” –Shweta Kulkarni

Best Example of Team work is Bill Gates, Paul Allen. They had brought the term into reality.

“Together means making base stronger for new innovations” – Shweta D.Kulkarni

Why Microsoft Technology?

2008-11-06T02:10:00.000-08:00

Why Microsoft Technology?

It was the core interest of Billionaire Computer genius Bill Gates and Paul Allen in computers gave birth to Microsoft. Microsoft continued in writing software and today its multibillion dollar company. They had gave birth to UI based next generation operating system in 1983 i.e. Microsoft windows and from then it has radically improved and grown as a popular name in computer industry.

In 1995 Gates introduced new dimension to connect the world and i.e. Internet Explorer. Microsoft software is everywhere and indeed. Microsoft has reduced complexity and enhanced its features in better ways. Its products are more secured, reliable and user friendly.

Microsoft technology over the period is becoming more innovative. It has established its root strongly in every area including development, networking, data warehousing etc and also in various domains in market along with that it had not only grown as huge empire but along with that it has also provided opportunities to so many people to use their technology for rampant progress in different domain . So many articles, news, interviews, sites, blogs talk about Microsoft technology. It has reached to the every small part of the world and that itself proves success of Microsoft as Technology specialist.

I can say that your core interest can drive you to highest goals as what Bill Gates has done and I salute him for his vision and contribution in software world.

About My Blog

2008-07-11T03:01:00.000-07:00

Hi Friends,

I am aware with Microsoft technology from last 7-8 years in which I have used various products of Microsoft, from basics to Windows and Web Applications. All of you might be working on these technologies they are very vast and deep to understand. This blog is for all who are part of IT industry especially for developers who can share their ideas,views,comments on the different software technology especially Microsoft technology. You can also share your technical problems, about it solution and everything that you feel about the technology. So welcome to my blog.