Creating A Login Window Using C# I Had A Problem In Code While Debbing The Code There Is A Problem That Issql Exception Were Unhandled How To Slove This Can You Help Me

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
this.Close();
}

private void button2_Click(object sender, EventArgs e)
{
SqlConnection con = new SqlConnection(@"Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Users\user\Documents\Data.mfd.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True");
con.Open();
SqlDataAdapter sda = new SqlDataAdapter(" Select Count (*) from emp_log where USER ID ='" + textBox1.Text + "'and PASSWORD = '" + textBox2.Text + "'", con);

DataTable dt = new DataTable();

sda.Fill(dt);(in this line my problem was while debbing the code an sqlexception was unhandled and invalid object emp_log was commingcan u help meto slove this )
con.Close();

if (dt.Rows[0][0].ToString() == "1")
{
this.Hide();
main ss = new main();
ss.Show();

}

else
{
MessageBox.Show("please check your user id or password");
}


}


}
}