creatuserwizard asp.net compnent using

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ASP.NET

sir,

public partial class PagesUser_WelcomeUser : System.Web.UI.Page
{
    string name;
    string mail;
    SqlConnection conn = new SqlConnection(@"Data Source=.\sqlexpress;AttachDbFilename=C:\Program Files\Microsoft SQL Server\MSSQL10.SQLEXPRESS\MSSQL\DATA\OnlineLibrary.mdf;Integrated Security=True");
    protected void Page_Load(object sender, EventArgs e)
    {
        name = Page.User.Identity.Name;
        //SqlDataAdapter adpmail = new SqlDataAdapter("select UserName,Email from aspnet_Membership M join aspnet_Users U on M.UserId=U.UserId where U.UserName='" + name + "'", conn);

        //DataSet dsmail = new DataSet();
        //adpmail.Fill(dsmail, "Library_user");
        //mail = dsmail.Tables[0].Rows[0]["Email"].ToString();
        //txtMail.Text = mail;

    }
    protected void btnsubmit_Click(object sender, EventArgs e)
    {
        pnlForm.Visible = false;
        btnsubmit.Visible = false;

        try
        {
            conn.Open();
            SqlCommand insert = new SqlCommand("Insert Library_User values('" + name + "','" + txtName.Text + "', " + txtAge.Text + ",'" + txtDesignation.Text + "','" + txtMail.Text + "','" + txtPhone.Text + "','" + txtAddress.Text + "','" + txtDD.Text + "')", conn);
            int insertRecord = insert.ExecuteNonQuery();
            if (insertRecord >= 1)
            {
                lblMsg.Text = "congradulation...your details have been registered";
                
            }
            else
            {
                lblMsg.Text = "Records not entered. Try again..!!!";
                lblMsg.Visible = true;

            }
            conn.Close();


        }
        catch
        {
            lblMsg.Text = "Your Records have been already entered. Please proceed...";
            lblMsg.Visible = true;
        }

i am creating user registeration page and after sucessfully registeration complete profile where user put his all information.i try take email id from userregisteration page itself line:name = Page.User.Identity.Name;
but it takes name as my server name by default its should take name from aspnet_db
kindly help