How to login - Wrong password and username

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C#

ASP.NET

SQL

M using asp login control . here is my code

<asp:Login ID="loginDetails"
                                UserNameRequiredErrorMessage="Enter user name" runat="server"
                                PasswordRecoveryText="Forgot Password?"
                                PasswordRecoveryUrl="~/ForgotPassword.aspx" FailureText="The user name or password is incorrect."
                                OnAuthenticate="login_Authenticate" ForeColor="Black" BackColor="#F7F7DE" BorderColor="#CCCC99"
                                BorderStyle="Solid" BorderWidth="1px" Font-Names="Verdana"
                                Font-Size="10pt" DisplayRememberMe="False" RememberMeText="">
                                <TitleTextStyle BackColor="#6B696B" Font-Bold="True" ForeColor="#FFFFFF" />

                            </asp:Login>

===============================================

Here is my login_Authenticate

protected void login_Authenticate(object sender, AuthenticateEventArgs e)
    {       
        string newUsername1 = loginDetails.UserName.TrimStart(' ');
        string newUsername2 = newUsername1.TrimEnd(' ');
        if (!IsPostBack)
        {            
                Session["x"] = txtUsename.Text;
                DataTable dt = new DataTable();
                dt = DLL.GetPersonId(txtUsename.Text, txtPassword.Text);
                Response.Redirect("Default.aspx");           
        }
        Session["Username"] = newUsername2.ToLower();
        if (Membership.ValidateUser(newUsername2.ToLower(), loginDetails.Password))
        {          
            e.Authenticated = false;
            if (e.Authenticated == true)
            {
                DataTable dt = DLL.GetPersonId(newUsername2.ToLower(), loginDetails.Password);
                if (dt.Rows.Count > 0)
                {
                    Session["Admin_Number"] = dt.Rows[0]["admin_Number"].ToString();
                }
            }
        }
        else
        {
            e.Authenticated = false;
        }
    }

====================================================
This is my GetPerson method

public DataTable GetPersonId(string username, string password)
       {
           DataTable dataTable = new DataTable();

           using (SqlConnection con = new SqlConnection(ConnString))
           {
               SqlCommand cmd = con.CreateCommand();
               cmd.CommandType = CommandType.StoredProcedure;
               cmd.CommandText = "GetUserID";



               cmd.Parameters.Add(new SqlParameter("@Admin_Username", SqlDbType.NVarChar, 10));
               cmd.Parameters["@Admin_Username"].Value = username;
               cmd.Parameters.Add(new SqlParameter("@Admin_password", SqlDbType.NVarChar, 10));
               cmd.Parameters["@Admin_Password"].Value = password;


               SqlDataAdapter da = new SqlDataAdapter(cmd);

               try
               {
                   con.Open();
                   da.Fill(dataTable);
               }
               catch (SqlException ex)
               {
                   throw new ApplicationException(ex.Message);
                   throw new ApplicationException("Error reading from database.");
               }
               return dataTable;
       }

When i try to put my username and password it always says wrong username and password

Please help!!!