Login SQL database code

public partial class frmLogin : Form
    {
        public frmLogin()
        {
            InitializeComponent();
        }
        //Connection string
        string cs = @"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=C:\Users\Pontus\Documents\Visual Studio 2017\Projects\Test\Login\Login\login.mdf;Integrated Security=True;Connect Timeout=30";

        private void btn_Submit_Click(object sender, EventArgs e)
        {
            if (txt_Username.Text=="" || txt_Password.Text=="")
            {
                MessageBox.Show("Please provide Username and Password.");
                return;
            }
            try
            {
                //Create SQLConnection
                SqlConnection con = new SqlConnection(cs);
                SqlCommand cmd = new SqlCommand("SELECT * FROM tbl_Login WHERE Username=@Username AND Password=@password", con);
                cmd.Parameters.AddWithValue("@Username", txt_Username.Text);
                cmd.Parameters.AddWithValue("@Password", txt_Password.Text);
                con.Open();
                SqlDataAdapter adapt = new SqlDataAdapter(cmd);
                DataSet ds = new DataSet();
                adapt.Fill(ds);
                con.Close();
                int count = ds.Tables[0].Rows.Count;
                //If count is equal to 1, then show frmmain Form
                if (count == 1)
                {
                    MessageBox.Show("Login Successful!");
                    this.Hide();
                    frmAdmin fa = new frmAdmin();
                    fa.Show();
                }
                else
                {
                    MessageBox.Show("Login Failed!");
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
                }

        private void frmLogin_Load(object sender, EventArgs e)
        {

        }

        private void checkBox_Show_Password_CheckedChanged(object sender, EventArgs e)
        {
            txt_Password.PasswordChar = checkBox_Show_Password.Checked ? '\0' : '*';
        }
    }
}