Login Error Message not displaying

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ASP.NET

I have a login screen that works fine. I have an issue when the user enters the username and password. The issue is when the user enters the correct username but incorrect password the error massage does not display. It works fine if the user enters the incorrect username and password. Can someone help me with this?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Configuration;
using System.Data;


public partial class Login : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (IsPostBack)
        {
            SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["PasswordConnectionString"].ConnectionString);
            con.Open();

            string cmdStr = "select count (*) from Table1 where EmailAddress='" + TextBoxEA.Text + "'";
            SqlCommand userExist = new SqlCommand(cmdStr, con);

            SqlCommand insertcmd = new SqlCommand("insert into Table1", con);
            SqlDataAdapter dap = new SqlDataAdapter(insertcmd);
            int temp = Convert.ToInt32(userExist.ExecuteScalar().ToString());
            con.Close();

            if (temp == 0)
                lblMessage.Text = "Invalid User Name and Password";
            
        }

    }
    protected void Button1_Click(object sender, EventArgs e)
    {

        SqlConnection con = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["PasswordConnectionString"].ConnectionString);
        con.Open();



        if (true)
        {
            SqlCommand level = new SqlCommand("select accessLevel, Password, INST_ID from Table1 where EmailAddress = @EmailAddress AND Password = @Password", con);
            level.Parameters.Add(new SqlParameter("EmailAddress", TextBoxEA.Text));
            level.Parameters.Add(new SqlParameter("Password", TextBoxPW.Text));

            SqlDataReader reader = level.ExecuteReader();
            DataTable dt1 = new DataTable();
            dt1.Load(reader);

            foreach (DataRow dr1 in dt1.Rows)
            {
                int returnedLevel = Convert.ToInt32(dr1[0].ToString());
                int inst_id = Convert.ToInt32(dr1[2].ToString());
                Session["inst_id"] = inst_id;
                    
                if (returnedLevel == 1)
                {
                    Response.Redirect("FormAPublic.aspx");
                }
                else if (returnedLevel == 2)
                {
                    Response.Redirect("FormCPrivateNon.aspx");
                }
                else if (returnedLevel == 3)
                {
                    Response.Redirect("FormDPrivateFor.aspx");
                }
                else if (returnedLevel == 7)
                {
                    Response.Redirect("CEOPage.aspx");
                }
                else if (returnedLevel == 8)
                {
                    Response.Redirect("DBPage.aspx");
                }
                else if (returnedLevel == 11)
                {
                    Response.Redirect("FormAPublicL.aspx");
                }
                else if (returnedLevel == 21)
                {
                    Response.Redirect("FormCPrivateNonL.aspx");
                }
                else if (returnedLevel == 31)
                {
                    Response.Redirect("FormDPrivateForL.aspx");
                }
                else if (returnedLevel == 0)
                {
                    lblMessage.Text = "Invalid UserName and Password";
                }
            }
        }
    }
}