I got error ProfileCommon could be not found , in my code. I don't know how to fix the error. I put namespace using system.Web.Profile, but error still does here. Could someone help how to do that? Please help me if you know. Thank you

public partial class UserProfile : System.Web.UI.UserControl
{
    private string _userName = "";
    public string UserName
    {
        get { return _userName; }

        set { _userName = value; }
    }

    protected void Page_Init(object sender, EventArgs e)
    {
        this.Page.RegisterRequiresControlState(this);
    }

    protected override void LoadControlState(object savedState)
    {
        object[] ctlState = (object[])savedState;
        base.LoadControlState(ctlState[0]);
        _userName = (string)ctlState[1];
    }

    protected override object SaveControlState()
    {
        object[] ctlState = new object[2];
        ctlState[0] = base.SaveControlState();
        ctlState[1] = _userName;
        return ctlState;
    }

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!this.IsPostBack)
        {
            // if the UserName property contains an emtpy string, retrieve the profile
            // for the current user, otherwise for the specified user
            ProfileCommon profile = this.Profile;
            if (this.UserName.Length > 0)
                profile = this.Profile.GetProfile(this.UserName);
            txtFirstName.Text = profile.FirstName;
            txtLastName.Text = profile.LastName;
            ddlGenders.SelectedValue = profile.Gender;
            if (profile.BirthDate != DateTime.MinValue)
                txtBirthDate.Text = profile.BirthDate.ToShortDateString();
            ddlOccupations.SelectedValue = profile.Occupation;
            txtWebsite.Text = profile.Website;
            txtStreet.Text = profile.Address.Street;
            txtCity.Text = profile.Address.City;
            txtPostalCode.Text = profile.Address.PostalCode;
            txtState.Text = profile.Address.State;
            txtPhone.Text = profile.Contacts.Phone;
            txtFax.Text = profile.Contacts.Fax;
        }
    }
    public void Save()
    {
        // if the UserName property contains an emtpy string, save the current user's
        // profile, othwerwise save the profile for the specified user
        ProfileCommon profile = this.Profile;
        if (this.UserName.Length > 0)
            profile = this.Profile.GetProfile(this.UserName);
        profile.FirstName = txtFirstName.Text;
        profile.LastName = txtLastName.Text;
        profile.Gender = ddlGenders.SelectedValue;
        if (txtBirthDate.Text.Trim().Length > 0)
            profile.BirthDate = DateTime.Parse(txtBirthDate.Text);
        profile.Occupation = ddlOccupations.SelectedValue;
        profile.Website = txtWebsite.Text;
        profile.Address.Street = txtStreet.Text;
        profile.Address.City = txtCity.Text;
        profile.Address.PostalCode = txtPostalCode.Text;
        profile.Address.State = txtState.Text;
        profile.Contacts.Phone = txtPhone.Text;
        profile.Contacts.Fax = txtFax.Text;
        profile.Save();
    }

The actual class ProfileCommon is created at runtime if ASP.NET profiles have been enabled. It does this because it creates properties for each of the fields you have enabled in the profile. Since it doesn't know what you have before it runs, it can't create the class. MSDN recommends that you create your own class derived from ProfileBase that has the fields you want, and use ProfileBase.Create to get the profile.

I download Web Profile generator, but I don't understand how to link with my project?

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