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Tuesday, 16 October 2012

Import contacts from Gmail using ASP.Net/C# Application


How to import contacts from GMAIL into ASP.Net/C# application
Some of the application especially social network application needs to have the feature for import contacts from our gmail account. By using this feature we can easily import all contacts from our gmail account and can send bulk mail to all or groups in our gmail account
 Is it possible import contacts from GMAIL account using ASP.Net/C# Application?
Of course, we can access and import our gmail contacts into our ASP.Net/C# application using gmail API. GMAIL itself providing some APIs to access gmail accounts from an external applications like ASP.Net or C#. We can call this API from our application by passing our gmail credentials, then will access our account from the application. Here we are demonstrating how we can use GMAIL API to get contacts in GMAIL account using ASP.Net/C# application.
 Very simple Steps to import GMAIL contacts from ASP.Net/C# application
Step-1:  Download Google data API setup.
 Here is the proper link for downloading particular API.
 In this link GMAIL providing so many APIs for communicating with their different project.
 Google.GData.Apps.dll, Google.GData.Client.dll, Google.GData.Contacts.dll, Google.GData.Extensions.dll are the major dll that’s should use for our application.
 Step-2:  Create a very simple ASP.Net application to import contacts from GMAIL. For a simple application, aspx page looks like this
 <html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>IMport Gmail Contacts</title>
</head>
<body>
<form id="frmGmailContacts" runat="server">
<div>
<table>
<tr>
<td>
UserName</td>
<td>
<asp:TextBox ID="txtUsername" 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="btnImport" runat="server" Text="Import"
onclick="btnImport_Click" />
</td>
</tr>
</table>
</div>
<div>
<asp:GridView ID="gdvContacts" runat="server"></asp:GridView>
</div>
</form>
</body>
</html>
 
Step 3 : In code behind we have to call API for getting contacts on button click event, and assign result set to gridview.

public static DataSet GetGmailContacts(string App_Name, string Uname,
string UPassword)
{
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);
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("Import GMAIL Contacts",
txtUsername.Text, txtPassword.Text);
gdvContacts.DataSource = ds;
gdvContacts.DataBind();
}

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