private void button1_Click(object sender, EventArgs e)
        {
            SqlConnection objConnection = new SqlConnection(@"Data Source=(LocalDB)MSSQLLocalDB;AttachDbFilename=c:userss.l.msourcereposEmam Hossein UniversityEmam Hossein UniversityLoginDatabase.mdf;Integrated Security=True");
            string query = "Select *from Login where Username = '" + textBox1.Text.Trim() + "'and Password = '" + textBox2.Text.Trim() + "'";
            SqlDataAdapter objDataAdapter = new SqlDataAdapter(query, objConnection);
            DataTable dataTable = new DataTable();
            objDataAdapter.Fill(dataTable);
            string userString = textBox1.Text.ToString();
            string passString = textBox2.Text.ToString();
            if (dataTable.Rows.Count == 1)
            {
                UniversityMainPage objform = new UniversityMainPage();
                this.Hide();
                objform.Show();

            }
            else
            {
                ErrorForm ef = new ErrorForm();
                ef.Show();
            }
        }