How to import Gmail Contacts in asp.net

To import the Gmail contacts using asp.net C#/VB, Below code is complete, you have to download the required dll and then copy paste that dll's into bin folder.

Click here to download dll

ImportGmailContacts.aspx

 <div id="ListingPage">
                    <h1>
                        Import GMail Contacts</h1>
                    <table width="95%" border="0">
                        <tr>
                            <td colspan="2" align="center" style="padding-left:2px;">
                                <span class="warning">
                                    <asp:Literal ID="litMessage" runat="server"></asp:Literal></span>
                            </td>
                        </tr>
                         <tr>
                            <td class="style1" valign="top" align="right"  width="20%">
                           Username :</td>
                        <td align="left"  width="20%">
                            <asp:TextBox ID="txtgmailusername" CssClass="inputBox" Width="180px" MaxLength="100" runat="server" ></asp:TextBox><br />
                            <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" CssClass="warning"
                                ControlToValidate="txtgmailusername" ErrorMessage="*" Text="Please enter Username" ValidationGroup="a"></asp:RequiredFieldValidator>
                        </td>
                        </tr>
                          <tr>
                            <td class="style1" valign="top" align="right"  width="20%">
                           Password :</td>
                        <td align="left"  width="20%">
                            <asp:TextBox ID="txtpassword" CssClass="inputBox" TextMode="Password" Width="180px" MaxLength="40" runat="server" ></asp:TextBox><br />
                            <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server"  CssClass="warning"
                                ControlToValidate="txtpassword" ErrorMessage="Group Name" Text="Please enter Password" ValidationGroup="a"></asp:RequiredFieldValidator>
                        </td>
                        </tr>
                        <tr>
                            <td width="25%" align="left" colspan="2" style="padding-left:130px;">
                                <asp:Button ID="btnAddtoFav" runat="server"   CssClass="btnSubmitSimple" ValidationGroup="a"
                                    OnClick="Button1_Click" AlternateText=" " Height="28" BorderWidth="0" />
                                &nbsp;&nbsp;&nbsp;&nbsp;<asp:HiddenField ID="hdnId" runat="server" />
                                &nbsp;
                            </td>
                        </tr>
                    </table>
                </div>
                </div>
 

ImportGmailContacts.aspx.cs          

 using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using Google.GData.Contacts;
using Google.GData.Client;
using Google.GData.Extensions;
using Google.Contacts;
namespace MBP
{
    public partial class GmailContacts : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }
 
        protected void Button1_Click(object sender, EventArgs e)
        {
            try
            {
                DataSet ds = new DataSet();
                DataTable dt = new DataTable();

                DataColumn C2 = new DataColumn();

                C2.DataType = Type.GetType("System.String");

                C2.ColumnName = "EmailID";

                dt.Columns.Add(C2);


                DataColumn C3 = new DataColumn();

                C3.DataType = Type.GetType("System.String");

                C3.ColumnName = "title";

                dt.Columns.Add(C3);


                RequestSettings rs = new RequestSettings("MyBridalPlanner.com", txtgmailusername.Text, txtpassword.Text);

                rs.AutoPaging = true;

                ContactsRequest cr = new ContactsRequest(rs);

                Feed<Contact> f = cr.GetContacts();
              
                foreach (Contact t in f.Entries)
                {

                    foreach (EMail email in t.Emails)
                    {

                        DataRow dr1 = dt.NewRow();

                        dr1["EmailID"] = email.Address.ToString();
                        dr1["title"] = t.Title.ToString();
                        dt.Rows.Add(dr1);

                    }

                }

                ds.Tables.Add(dt);

                if (ds != null)
                {
                    if (ds.Tables[0].Rows.Count > 0)
                    {
                        DataTable dt1 = ds.Tables[0];

                        if (dt1 != null)
                        {
                            foreach (DataRow dr in dt1.Rows)
                            {
                                MBP_GuestList guest = GuestMgmtClass.GetData(0);
                                bool isNew = guest == null;
                                if (guest == null)
                                {
                                    guest = new MBP_GuestList();
                                    guest.added = DateTime.Now;

                                }
                                else
                                {
                                    guest.updated = DateTime.Now;
                                }
                                guest.Email = dr["EmailID"].ToString();

                                if (!GuestMgmtClass.DuplicateGuestByEmail(guest.Email, Convert.ToInt32(User.Identity.Name)))
                                {
                                    string name = dr["title"].ToString();

                                    string FName = string.Empty;
                                    string LName = string.Empty;
                                    if (name.Length > 0)
                                    {
                                        string[] namestr = name.Split(' ');
                                        if (namestr.Length > 0)
                                            FName = namestr[0].ToString();
                                        if (namestr.Length > 1)
                                            LName = namestr[1].ToString();
                                    }

                                    guest.FirstName = FName;
                                    guest.LastName = LName;
                                    guest.Relation = "";
                                    guest.Phone = "";
                                    guest.address = "";
                                    guest.IsActive = true;
                                    guest.RSVP = false;
                                    guest.Memberid = Convert.ToInt32(User.Identity.Name);
                                    guest = GuestMgmtClass.SetData(guest);
                                }

                            }
                        }
                        litMessage.Text = "Contacts imported successfully.";

                    }
                }
            }
            catch (Exception ex)
            {
                if (ex.Message.ToLower().Contains("invalid"))
                {
                    litMessage.Text = ex.Message;
                }
                else
                {
                    litMessage.Text = "Invalid Credentials.";
                }
               
                   
            }
        }
    }
}

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