ASP & RELATED TECHNOLOGIES: October 2015

Tuesday 20 October 2015

How to work with WCF?

Windows Communication Foundation (WCF) is a framework for building service-oriented applications.

Let's see how to create a simple service in WCF.

Open Visual Studio. Go to File->New->Project->WCF Service Application

Give name to your application such as WcfService.

Now one service is created by default. Get rid of that because we want to implement our service.

So delete service1.svc and IService1.cs.

[Note: Services have .svc extension]

Now right click on the project name and Add New item(OR ctrl+shift+A ) --> WCF Service.

Give your service name as MyService and click add.

MyService.svc and IMyService.cs is added to your project.

MyService.svc is our Service and IMyService.cs is Interface.

In IMyService.cs we can declare our methods and since MyService.svc inherits from IMyService.cs so we have to implement all methods in our service that is defined in Interface.

By default we have void DoWork() declared in interface and implemented in our service.Delete

[OperationContract]

void DoWork();

from IMyService.cs and

public void DoWork()

{

}

from MyService.svc.cs.

Now add some Method to IMyService.cs as

[OperationContract]

string welcome(string name);

[OperationContract]

int Sum(int FN,int SN);

Now Go to MyService.svc.cs.

On public class MyService : IMyService line double click on IMyService and press ctrl+.(Dot)

You get 'Implement interface IMyService'. Click on that to generate function signature and change according to following

just paste following in MyService.svc.cs.

public string welcome(string name)

{

return "Hello "+name;

}

public int Sum(int FN, int SN)

{

return FN + SN;

}

Now run your project. On left side you see the methods. Click on welcome().

In welcome window give the value of parameter name in Request and Click Invoke Button.

If Security warning appears click on OK and you see your output in Response beneath Request in

Welcome window.

Similarly Click on Sum() and pass value for parameter FN and SN and you get the result.

Now, Let me cover some theory part also.

Contracts: In WCF, All services exposes the contracts. The contract is a platform independent

and standard way of descibing what the services does.

Service Contract: Describe what operation client can perform on the services.

Data Contract: Defines which data type are passed to and from the service.

Note: Without Service Contract attribute the contact is not visible to WCF clients.

Monday 19 October 2015

Display Digital Clock In Browsers Using JavaScript

<!DOCTYPE html>

<html>

<body>

var myVar = setInterval(myTimer, 1000);

function myTimer() {

var d = new Date();

document.getElementById("display").innerHTML = d.toLocaleTimeString();

}

</script>

</body>

</html>

Sunday 18 October 2015

Export Gridview to Excel OR Word using Asp.Net

1: Export to Excel

protected void btnExportGridToExcel_Click(object sender, EventArgs e)

{

// It clears all content from the buffer

Response.ClearContent();

Response.AppendHeader("content-disposition", "attachment;filename=Students.xls");

//Specify the type that you want to change

//Here we want to change in Excel

Response.ContentType = "application/excel";

System.IO.StringWriter stw = new System.IO.StringWriter();

System.Web.UI.HtmlTextWriter htw = new System.Web.UI.HtmlTextWriter(stw);

gvStudents.RenderControl(htw);

Response.Write(stw.ToString());

Response.End();

}

2: Export to Word Document

protected void btnExportGridToExcel_Click(object sender, EventArgs e)

{

// It clears all content from the buffer

Response.ClearContent();

Response.AppendHeader("content-disposition", "attachment;filename=Students.doc");

//Specify the type that you want to change

//Here we want to change in Excel

Response.ContentType = "application/word";

System.IO.StringWriter stw = new System.IO.StringWriter();

System.Web.UI.HtmlTextWriter htw = new System.Web.UI.HtmlTextWriter(stw);

gvStudents.RenderControl(htw);

Response.Write(stw.ToString());

Response.End();

}

Although, When we run project we get error as Control 'gvStudents' of type 'GridView' must be placed inside a form tag with runat=server.

To Remove this error we have to override VerifyRenderingInServerForm() Method.

For this type in Visual studio Override VerifyRenderingInServerform() and then hit ENTER key.We will get:

public override void VerifyRenderingInServerForm(System.Web.UI.Control control)
{
base.VerifyRenderingInServerForm(control);
}

Since we don't have any requirement of its implementation so just delete base.VerifyRenderingInServerForm(control);
from above Method. And Your application will work now. :-)

Export GridView To Excel or Word Document

Rajeev Title

Tuesday 20 October 2015

How to work with WCF?

Monday 19 October 2015

Display Digital Clock In Browsers Using JavaScript

Sunday 18 October 2015

Export Gridview to Excel OR Word using Asp.Net

1: Export to Excel

2: Export to Word Document