And now it's fully working by adding the following stuff to the datacontract:

[DataMember(Name = "emailAddress")]
public new string Email
{
get
{
return base.Email;
}
set
{
base.Email = value;
}
}


[DataMember(Name = "formattedName")]
public new string Name
{
get
{
return base.Name;
}
set
{
base.Name = value;
}
}

[DataMember(Name = "fistName")]
public override string FirstName
{
get
{
return base.FirstName;
}
set
{
base.FirstName = value;
}
}


[DataMember(Name = "lastName")]
public override string LastName
{
get
{
return base.LastName;
}
set
{
base.LastName = value;
}
}

this Linkedin authentication provider source code but have error in return from linkedin can fix this

https://www.dropbox.com/s/pdx08nc0agy...