First Download openinviter from http://openinviter.com/download.php and edit example.php to adjust it for your needs
Just like, below php file (example).
include('openinviter.php');
$inviter=new OpenInviter();
$oi_services=$inviter->getPlugins();
if (isset($_POST['provider_box']))
{
if (isset($oi_services['email'][$_POST['provider_box']])) $plugType='email';
elseif (isset($oi_services['social'][$_POST['provider_box']])) $plugType='social';
else $plugType='';
}
else $plugType = '';
function ers($ers)
{
if (!empty($ers))
{
//$contents="
| ";
foreach ($ers as $key=>$error)
$contents.="{$error}
";
//$contents.=" |
";
return $contents;
}
}
function oks($oks)
{
if (!empty($oks))
{
$contents="
 | ";
foreach ($oks as $key=>$msg)
$contents.="{$msg}
";
$contents.=" |
";
return $contents;
}
}
if (!empty($_POST['step'])) $step=$_POST['step'];
else $step='get_contacts';
$ers=array();$oks=array();$import_ok=false;$done=false;
if ($_SERVER['REQUEST_METHOD']=='GET')
{
$plugType='email';
if ($step=='get_contacts')
{
if (empty($_GET['email_box']))
$ers['email']="Email missing !";
if (empty($_GET['password_box']))
$ers['password']="Password missing !";
if (empty($_GET['provider_box']))
$ers['provider']="Provider missing !";
if (count($ers)==0)
{
$inviter->startPlugin($_GET['provider_box']);
$internal=$inviter->getInternalError();
if ($internal)
$ers['inviter']=$internal;
elseif (!$inviter->login($_GET['email_box'],$_GET['password_box']))
{
$internal=$inviter->getInternalError();
$ers['login']=($internal?$internal:"Login failed. Please check the email and password you have provided and try again later !");
}
elseif (false===$contacts=$inviter->getMyContacts())
$ers['contacts']="Unable to get contacts !";
else
{
$import_ok=true;
$step='send_invites';
$_GET['oi_session_id']=$inviter->plugin->getSessionID();
$_GET['message_box']='';
}
}
}
elseif ($step=='send_invites')
{
if (empty($_POST['provider_box'])) $ers['provider']='Provider missing !';
else
{
$inviter->startPlugin($_POST['provider_box']);
$internal=$inviter->getInternalError();
if ($internal) $ers['internal']=$internal;
else
{
if (empty($_POST['email_box'])) $ers['inviter']='Inviter information missing !';
if (empty($_POST['oi_session_id'])) $ers['session_id']='No active session !';
if (empty($_POST['message_box'])) $ers['message_body']='Message missing !';
else $_POST['message_box']=strip_tags($_POST['message_box']);
$selected_contacts=array();$contacts=array();
$message=array('subject'=>$inviter->settings['message_subject'],'body'=>$inviter->settings['message_body'],'attachment'=>"\n\rAttached message: \n\r".$_POST['message_box']);
if ($inviter->showContacts())
{
foreach ($_POST as $key=>$val)
if (strpos($key,'check_')!==false)
$selected_contacts[$_POST['email_'.$val]]=$_POST['name_'.$val];
elseif (strpos($key,'email_')!==false)
{
$temp=explode('_',$key);$counter=$temp[1];
if (is_numeric($temp[1])) $contacts[$val]=$_POST['name_'.$temp[1]];
}
if (count($selected_contacts)==0) $ers['contacts']="You haven't selected any contacts to invite !";
}
}
}
if (count($ers)==0)
{
$sendMessage=$inviter->sendMessage($_POST['oi_session_id'],$message,$selected_contacts);
$inviter->logout();
if ($sendMessage===-1)
{
$message_footer="\r\n\r\nThis invite was sent using OpenInviter technology.";
$message_subject=$_POST['email_box'].$message['subject'];
$message_body=$message['body'].$message['attachment'].$message_footer;
$headers="From: {$_POST['email_box']}";
foreach ($selected_contacts as $email=>$name)
mail($email,$message_subject,$message_body,$headers);
$oks['mails']="Mails sent successfully";
}
elseif ($sendMessage===false)
{
$internal=$inviter->getInternalError();
$ers['internal']=($internal?$internal:"There were errors while sending your invites.
Please try again later!");
}
else $oks['internal']="Invites sent successfully!";
$done=true;
}
}
}
else
{
$_POST['email_box']='';
$_POST['password_box']='';
$_POST['provider_box']='';
}
if (!$done)
{
if ($step=='get_contacts')
{
}
else{}
}
if (!$done)
{
if ($step=='send_invites')
{
if ($inviter->showContacts())
{
if (count($contacts)==0){}
else
{
$odd=true;$counter=0;
foreach ($contacts as $email=>$name)
{
$counter++;
if ($odd) {}
$contents.= "{$email}".",";
$odd=!$odd;
}
}
}
}
}
print_r($contents);
?>
Then create one class like that.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.IO;
using System.Net;
using System.Text;
using System.Data;
///
/// Summary description for ImportsContacts
///
public class ImportsContacts
{
public ImportsContacts()
{
//
// TODO: Add constructor logic here
//
}
public static DataTable GetDataTableFromArray(string url, string provider, string email, string pass)
{
DataTable dt = new DataTable();
///get all contact from url as array format
///split into array
object[] array = TinyEAIPostRequest(+ url +"/example.php?step=get_contacts&provider_box=?step=get_contacts&provider_box=" + provider + "&email_box=" + email + "&password_box=" + pass , string.Empty).Split(',');
dt.Columns.Add(new DataColumn("EmailID"));
for (int i = 0; i <>
{
DataRow dr = dt.NewRow();
dr["EmailID"] = array[i];
dt.Rows.Add(dr);
}
return dt;
}
public static string TinyEAIPostRequest(string strURL, string strRequest)
{
HttpWebResponse objHttpWebResponse = null;
UTF8Encoding encoding;
string strResponse = "";
HttpWebRequest objHttpWebRequest;
objHttpWebRequest = (HttpWebRequest)WebRequest.Create(strURL);
objHttpWebRequest.ContentType = "application/x-www-form-urlencoded";
objHttpWebRequest.PreAuthenticate = true;
objHttpWebRequest.Method = "GET";
//Prepare the request stream
if (strRequest != null && strRequest != string.Empty)
{
encoding = new UTF8Encoding();
Stream objStream = objHttpWebRequest.GetRequestStream();
Byte[] Buffer = encoding.GetBytes(strRequest);
// Post the request
objStream.Write(Buffer, 0, Buffer.Length);
objStream.Close();
}
objHttpWebResponse = (HttpWebResponse)objHttpWebRequest.GetResponse();
encoding = new UTF8Encoding();
StreamReader objStreamReader = new StreamReader(objHttpWebResponse.GetResponseStream(), encoding);
strResponse = objStreamReader.ReadToEnd();
objHttpWebResponse.Close();
objHttpWebRequest = null;
return strResponse;
}
}
Then
Call example.php file from your aspx file.
see below code how to call php file using asp.net
DataTable dt = ImportsContacts.GetDataTableFromArray(url +"/example.php", ddlmailoption.SelectedValue, txtusername.Text, txtpass.Text);//GContactsImport.GetGmailContacts(App_Name, txtusername.Text, txtpass.Text);
repgooglecontact.DataSource = dt;
repgooglecontact.DataBind();
I hope you will get good result and help to you. 
