Why code return false value when username and password are correct?

Question

class Student : DbConnection

{

public string stud_Username { set; get; }

public string stud_Password { set; get; }

public bool verify_User()

{

connectDb.Open();

SqlDataReader rd;

bool check = false;

using (var cmd = new SqlCommand())

{

cmd.CommandText = "SELECT * FROM stud_Login_Table WHERE Username=@user AND Password=@pass";

cmd.CommandType = CommandType.Text;

cmd.Connection = connectDb;

cmd.Parameters.Add("@user", SqlDbType.VarChar).Value = stud_Username;

cmd.Parameters.Add("@pass", SqlDbType.VarChar).Value = stud_Password;

rd = cmd.ExecuteReader();

while (rd.Read())

{

MessageBox.Show("Connected to database..");

}

connectDb.Close();

}

return check;

}

 

 

 

DbConnection conn = new DbConnection();

Student stud = new Student();

 

 

 

private void loginButton_Click(object sender, EventArgs e)

{

stud.stud_Username= studUser.Text;

stud.stud_Password = studPass.Text;

bool verify = stud.verify_User();

if (verify==true)

{

MessageBox.Show(" Logged in ");

Home home = new Home();

home.Show();

this.Hide();

}

else

{

MessageBox.Show("Check your Username and password !!");

}