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How to import Contacts from GMAIL using ASP.NET and C#

Step-1: Download Google data API setup from the specified URL

http://code.google.com/p/google-gdata/

Or you can directly download with the following

http://google-gdata.googlecode.com/files/Google%20Data%20API%20Setup%281.4.0.2%29.msi

That Set Up will installs set of Google Data dll’s (Google.GData.Apps.dll, Google.GData.Client.dll, Google.GData.Contacts.dll, Google.GData.Extensions.dll) into client installed Machine, you should collect that dll’s for your program.

Step-2: Design our aspx page (Default.aspx) by using with the following UI as simple scenario.

<html xmlns=”http://www.w3.org/1999/xhtml”>

<head runat=”server”>
<title>IMport Gmail Contacts</title>
</head>
<body>
<form id=”form1″ runat=”server”>
<div>
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<table>
<tr>
<td>
UserName</td>
<td>
<asp:TextBox ID=”txtgmailusername” runat=”server”></asp:TextBox>
</td>
</tr>
<tr>
<td>
Password</td>
<td>
<asp:TextBox ID=”txtpassword” runat=”server” TextMode=”Password”></asp:TextBox>
</td>
</tr>
<tr>
<td>
</td>
<td>
<asp:Button ID=”Button1″ runat=”server” Text=”Button” onclick=”Button1_Click” />
</td>
</tr>
</table>
</div>
<div>
<asp:GridView ID=”gvmails” runat=”server”></asp:GridView>
</div>
</form>
</body>
</html>
Step-3: Add those downloaded google dll’s as reference to your website in visual studio->Solution Explorer ->Right Click-> Click on Add Reference….->Browse ->Get dll’s from Installed Location->Press OK.
Step-4:

A) Add namespace these namespace

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to your code behind

using Google.GData.Contacts;

using Google.GData.Client;
using Google.GData.Extensions;
using Google.Contacts;

B) After that write following code in code behind
public static DataSet GetGmailContacts(string App_Name, string Uname, string UPassword)

{
DataSet ds = new DataSet();
DataColumn C2 = new DataColumn();
C2.DataType = Type.GetType(“System.String”);
C2.ColumnName = “EmailID”;
dt.Columns.Add(C2);
RequestSettings rs = new RequestSettings(App_Name, Uname, UPassword);
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();
dt.Rows.Add(dr1);
}
}
ds.Tables.Add(dt);
return ds;
}
protected void Button1_Click(object sender, EventArgs e)
{
DataSet ds = GetGmailContacts(“MyNetwork Web Application!”, txtgmailusername.Text, txtpassword.Text);
gvmails.DataSource = ds;
gvmails.DataBind();
}

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