public interface IUserInfo
{
    string Name
    {
        get;
    }
}

public abstract class UserInfoBase : IUserInfo
{
    public abstract string Name
    {
        get;
    }

    string IUserInfo.Name
    {
        get
        {
            return this.Name;
        }
    }
}


public class UserInfoImpl : UserInfoBase
{
    public UserInfoImpl(string name)
    {
        this._name = name;
    }

    private string _name;
    public override string Name
    {
        get
        {
            return this._name;
        }
    }
}