Ankur Bhatnagar

Sunday 20 January 2013

Getting Facebook Contacts in 4 Simple Steps

Here I am giving you simple demonstration about how to import contacts from Facebook.

Step 1: Create a facebook app at https://developers.facebook.com/

I have created a try app which I am using to get my FB contacts:

client_id=345255442153376

Client_Secret=dba2c658b768480a616d7fc7f198e725 &

redirect_uri=http://localhost:6209/default.aspx

After completing step 1 go to step 2.

Step 2: Browse to the below url in browser window:

https://www.facebook.com/dialog/oauth?client_id=345255442153376&redirect_uri=http://localhost:6209/default.aspx&scope=publish_stream

it will ask for permissions click Allow Button:

This will give u a window like below which is having code=some_code like query string in browser window we need to use this code further.

http://localhost:6209/default.aspx?code=AQDAklJNfyMiZvOSUZBCHgw0KTwIQoJRPoN0tTJ90CJL6Xb547wHRaKlem81WWQsg_59o-OI9-VpoF7O0UQ09wAqn6AUV0QX7CYreYvlIQjPS4D5ptoUxJep1hJ5CGgo9zCayyaS5W8emja39bUYas4SvdsR9vLLVnGOCDDGgmvrO4e0enIh5nXchXbb3JxJw6EDz4Cqf2OSzunCLLWEZxux#_=_

We need to use code

(code=AQDAklJNfyMiZvOSUZBCHgw0KTwIQoJRPoN0tTJ90CJL6Xb547wHRaKlem81WWQsg_59o-OI9-VpoF7O0UQ09wAqn6AUV0QX7CYreYvlIQjPS4D5ptoUxJep1hJ5CGgo9zCayyaS5W8emja39bUYas4SvdsR9vLLVnGOCDDGgmvrO4e0enIh5nXchXbb3JxJw6EDz4Cqf2OSzunCLLWEZxux#_=) in next step.

Step3 : Now browse to the url in browser window:

https://graph.facebook.com/oauth/access_token?client_id=345255442153376&redirect_uri=http://localhost:6209/default.aspx&Client_Secret=dba2c658b768480a616d7fc7f198e725&code=AQASA2AICGdOzLUOa8CiTgnrJY0Seme7Jx8qNY95rnO2_DvqLxy31AQo3uMtNCAm__7qfofH4rQflmNY_W_RcRmO2NFsQMichY4tvqlgGQRtwag7zXO-Yb54MtUhx4jC1_u_PNfx0080yvln2NDn1txy2Qpt5dJB18aHKUTWuwsFvGKYxY-uPhFY2brklHcIzM_-svv2NZ3QWwqnHfG9_UVs#_=_

Note: we need to use same code which we have retrieved in step2.

This step will give you an access token as query string. Something likes this:

http://localhost:6209/default.aspx?access_token=AAACEdEose0cBAM3Dbomr0wlNsMySIa8QGavZB15onOZAGZBGi8bPLHLOZCl6HXVCTNO17sPLArfThihlAbosDlyfbFJyZAOh2EHVbWZB3WbKxAX1o5E9Gi

access_token= AAACEdEose0cBAM3Dbomr0wlNsMySIa8QGavZB15onOZAGZBGi8bPLHLOZCl6HXVCTNO17sPLArfThihlAbosDlyfbFJyZAOh2EHVbWZB3WbKxAX1o5E9Gi

Now we need to use this access i to get contacts in next step.

Step 4: Browse to the below url and it will give u contacts in Json format.

https://graph.facebook.com/me?access_token=AAACEdEose0cBAM3Dbomr0wlNsMySIa8QGavZB15onOZAGZBGi8bPLHLOZCl6HXVCTNO17sPLArfThihlAbosDlyfbFJyZAOh2EHVbWZB3WbKxAX1o5E9Gi/me/friends

Note: we need to use same access token which we have retrieved in step3.

For implementing above code you need to use asp.net HttpRequest and HttpResponse Objects.

For more go to:

https://developers.facebook.com/docs/appsonfacebook/tutorial/

Wednesday 4 July 2012

update values in parent window from child

This example explains how to Open PopUp Window In Asp.Net And Update Refresh Parent Child Values using ClientScript .

I am opening popup window from aspx page and updating values in parent window from child or popup window using javascript

I have added to labels in Home.aspx page and one button to open popup window.

I've also added a PopupWindow.aspx page which is having two textboxes and a button to update lable values of parent page.

The textboxes in popup window are populated with Text values of lables in parent page (Home.aspx), after making changes in textbox values i'm updating values back in parent page.

HTML source Parent page (Home.aspx)

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Home.aspx.cs" Inherits="JavaScriptDemo.Home" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script type="text/javascript">
function openPopUp() {
var firstName = document.getElementById("txtFirstName").value;
var lastName = document.getElementById("txtLastName").value;
var url = "popupWindow.aspx?firstname=" + firstName + "&lastname=" + lastName;
window.open(url, "popup", "width=400,height=200,left=300,top=150");
}

function updateValues(arr) {
document.getElementById("txtFirstName").value = arr[0];
document.getElementById("txtLastName").value = arr[1];
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
   
<asp:Label ID="lblFirstName" runat="server" Text="First Name"></asp:Label> 
<asp:TextBox ID="txtFirstName" runat="server"></asp:TextBox>
<br />
<br />
  
<asp:Label ID="lblLastName" runat="server" Text="Last Name"></asp:Label> 
<asp:TextBox ID="txtLastName" runat="server"></asp:TextBox>
<br />
<br />
                     
<asp:Button ID="btnModify" runat="server" Text="Modify" OnClientClick="openPopUp()" />
</div>
</form>
</body>
</html>

HTML SOURCE OF PopupWindow.aspx(child) page

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="popupWindow.aspx.cs" Inherits="JavaScriptDemo.popupWindow" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

function updateParentAndClose() {

var arr = new Array();

arr.push(document.getElementById("txtFirstName").value);

arr.push(document.getElementById("txtLastName").value);

window.opener.updateValues(arr);

window.close();

}

</script>

</head>

<body>

<div>

<asp:Label ID="lblFirstName" runat="server" Text="First Name"></asp:Label> 

<asp:TextBox ID="txtFirstName" runat="server"></asp:TextBox>

<br />

<asp:Label ID="lblLastName" runat="server" Text="Last Name"></asp:Label> 

<asp:TextBox ID="txtLastName" runat="server"></asp:TextBox>

<br />

<asp:Button ID="btnModify" runat="server" Text="Modify" OnClientClick="updateParentAndClose()" />

</div>

</form>

</body>

</html>

SOURCE OF PopupWindow.aspx,cs (child) page

protected void Page_Load(object sender, EventArgs e)

{

if (Request.QueryString["firstname"] != null)

{

txtFirstName.Text = Request.QueryString["firstname"];

txtLastName.Text = Request.QueryString["lastname"];

}

Wednesday 11 April 2012

Data Reader In ADO.NET

using System;
using System.Data.SqlClient;

class Program
{
static void Main()
{
SqlConnection con=new SqlConnection();
con.ConnectionString="server=.;database=student;integrated security=true;";
SqlCommand cmd=new SqlCommand();
cmd.Connection=con;
cmd.CommandText="SELECT * FROM student";
SqlDataReader reader;
con.Open();
reader=cmd.ExecuteReader();

Console.WriteLine("Sno\tSname\t\tCourse\tDuration");
Console.WriteLine("-------------------------------------------------------------------");
while(reader.Read())
{
Console.WriteLine("{0}\t{1}\t{2}\t{3}",reader["Sno"],reader["Sname"],reader["Cname"],reader["duration"]);
Console.WriteLine();
}
reader.Close();
con.Close();
}
}

DataBase Connectivity in c#

using System;
using System.Data.SqlClient;

class Program
{
static void Main()
{
SqlConnection con=new SqlConnection();
SqlCommand cmd=new SqlCommand();
int n;
string command;

con.ConnectionString="server=.;database=Student;integrated security=true;";
cmd.Connection=con;

// command="CREATE TABLE student(Sno INT PRIMARY KEY IDENTITY(1,1),Sname VARCHAR(30),Cname VARCHAR(30),Duration INT)";
// cmd.CommandText=command;

// con.Open();
// Console.WriteLine("Connected to Sql Server");
// cmd.ExecuteReader();
// Console.WriteLine("Table Created Successfully");
// con.Close();

command="INSERT INTO student(Sname,Cname,Duration) VALUES ('SMRITI DABGAR','.NET',90)";
cmd.CommandText=command;

con.Open();
n=cmd.ExecuteNonQuery();
Console.WriteLine("{0} Records Inserted Successfully",n);
con.Close();

command="DELETE FROM student WHERE sno=1";
cmd.CommandText=command;

con.Open();
n=cmd.ExecuteNonQuery();
Console.WriteLine("{0} Records Deleted Successfully",n);
con.Close();

command="UPDATE student SET sname='ANKUR BHATNAGAR' WHERE sno=2";
cmd.CommandText=command;

con.Open();
n=cmd.ExecuteNonQuery();
Console.WriteLine("{0} Records Updated Successfully",n);
con.Close();

command="SELECT count(*) FROM student WHERE Cname='.NET'";
cmd.CommandText=command;

con.Open();
object ob=cmd.ExecuteScalar();
Console.WriteLine("Total No Of Records in .NET is: {0}",(int)ob);
con.Close();
}
}

StringBuilder in C#

//String classs and StringBuilder Class Comparision
using System;
using System.Text;
class Program
{
static void Main()
{
StringBuilder sb=new StringBuilder();

Console.WriteLine("\n......................String Builder Example......................\n");

sb.Append("This is a example of string");

Console.WriteLine("\nActual String is: '{0}'",sb.ToString());

sb.Replace("string","StringBuilder");
Console.WriteLine("\nAfter Replace String is: '{0}'",sb.ToString());

sb.Insert(0,"Extra ");
Console.WriteLine("\nAfter Insert String is: '{0}'",sb.ToString());

sb.Remove(0,5);
Console.WriteLine("\nAfter Remove String is: '{0}'",sb.ToString());

Console.WriteLine("\nStart Time: {0}",DateTime.Now.ToString("T"));
for(int i=0;i<100000;i++)
sb.Append(i);
Console.WriteLine("\nEnd Time: {0}",DateTime.Now.ToString("T"));

Console.WriteLine("\n......................String Example......................\n");
string s1="";

Console.WriteLine("\nStart Time: {0}",DateTime.Now.ToString("T"));
for(int i=0;i<100000;i++)
s1=s1+i;
Console.WriteLine("\nEnd Time: {0}",DateTime.Now.ToString("T"));
}
}

String Funtions in C#

// Program to demonstrate sting funtions
//Instance level funtions: ToUpper(), ToLower(), Trim(), Split(), IndexOf(), LastIndexOf(), Substing(), Contains
//Static Funtions: Concat()
using System;
class Program
{
static void Main()
{
string s1,s2;
s1="Hello";
s2="World";

s1=string.Concat(s1,s2);
Console.WriteLine("Cancat Result: {0}",s1);

Console.WriteLine("Upper Result: {0}",s1.ToUpper());
Console.WriteLine("Lower Result: {0}",s1.ToLower());

bool b=s1.Contains("World");
Console.WriteLine("Contains Result: {0}",b);

int n=s1.IndexOf("llo");
Console.WriteLine("IndexOF Result: {0}",n);

n=s1.LastIndexOf('l');
Console.WriteLine("LastIndexOf Result: {0}",n);

Console.WriteLine("Substring Result: {0}",s1.Substring(3));
Console.WriteLine("substring Result: {0}",s1.Substring(3,5));

s2=" Ankur Bhatnagar ";
Console.WriteLine("Before Trim Result: {0}",s2.Length);
s2=s2.Trim();
Console.WriteLine("After Trim Result: {0}",s2.Length);

s2="ASP.NET,C#.NET,VB.NET";
string[] str=s2.Split(',');
Console.WriteLine("Split Result:");
foreach(string item in str)
{
Console.WriteLine("{0}",item);
}
}
}

Thursday 22 March 2012

Exception Handling in c#

//Program to handle exception using try catch finally
using System;
class Program
{
static void Main()
{
int x,y,z=0;

try
{
Console.Write("Enter X: ");
x=int.Parse(Console.ReadLine());
Console.WriteLine();

Console.Write("Enter Y: ");
y=int.Parse(Console.ReadLine());
Console.WriteLine();

z=x/y;
}
catch(Exception exp) //It is called as Most General Exception.It can handle all the exception because it is a top most pareant of all other exceptions
//class.So accourding to 'Run Time Polymorphism' Parent class contains the object of their children.
{
Console.WriteLine(exp.Message);
}
finally
{
Console.WriteLine("Result: {0}",z);
}
}
}