private void addStudentToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Student_Info st = new Student_Info();

            st.Show();
            this.Hide();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            string username = txtusername.Text;
            string password = txtpassword.Text;

            if (username == "")
            {
                errorProvider1.SetError(txtusername, "Name is Missing");
            }
            else if (password == "")
            {
                errorProvider1.SetError(txtpassword, "Password is Missing");
            }

            //else if(username=="1" && password == "osama")
            // {

            //     Student_Info mf = new Student_Info();
            //     mf.Show();
            //     MessageBox.Show("You Login In Successfully");
            // }

            string         query = "Select * from LoginDB where username ='******'and Password='******'";
            SqlDataAdapter da    = new SqlDataAdapter(query, conn);
            DataTable      dt    = new DataTable();

            da.Fill(dt);
            if (dt.Rows.Count == 1)
            {
                Student_Info st = new Student_Info();
                st.Show();
                this.Hide();
            }



            //SqlDataAdapter da =new SqlDataAdapter("Select count(*) FROM LoginForm Where Username='******',Password='******'",conn);
            //DataTable dt = new DataTable();
            //da.Fill(dt);
            //if (dt.Rows[0][0].ToString() =="1")
            //{
            //    this.Hide();
            //    Student_Info mf = new Student_Info();
            //    mf.Show();
            //    MessageBox.Show("You Login SuccessFully");
            //}
            else
            {
                MessageBox.Show("Invalid Username & Password");
            }

            //conn.Open();
            //string query = "Select * FROM LoginForm";
            //SqlDataAdapter da = new SqlDataAdapter(query, conn);
            //DataTable dt = new DataTable();
            //da.Fill(dt);
            //conn.Close();
        }