private void button1_Click(object sender, EventArgs e)
 {
     if (textBox1.Text.Length == 8)
     {
         if (abl.IsValidAdmin(textBox1.Text, textBox2.Text))
         {
             loginUserName = textBox1.Text;
             this.Hide();
             AdminPage obj = new AdminPage(loginUserName);
             obj.Show();
             MessageBox.Show("LogIn Successful");
         }
         else
         {
             MessageBox.Show("Please check your UserName and Password");
             textBox1.Text = "";
             textBox2.Text = "";
         }
     }
     else if (textBox1.Text.Length == 7)
     {
         if (fbl.IsValidCSFaculty(textBox1.Text, textBox2.Text))
         {
             loginUserName = textBox1.Text;
             department    = "CS";
             this.Hide();
             FacultyPage fp = new FacultyPage(loginUserName, department);
             fp.Show();
             MessageBox.Show("LogIn Successful");
         }
         else if (fbl.IsValidEEEFaculty(textBox1.Text, textBox2.Text))
         {
             loginUserName = textBox1.Text;
             department    = "EEE";
             this.Hide();
             FacultyPage fp = new FacultyPage(loginUserName, department);
             fp.Show();
             MessageBox.Show("LogIn Successful");
         }
         else if (fbl.IsValidBBAFaculty(textBox1.Text, textBox2.Text))
         {
             loginUserName = textBox1.Text;
             department    = "BBA";
             this.Hide();
             FacultyPage fp = new FacultyPage(loginUserName, department);
             fp.Show();
             MessageBox.Show("LogIn Successful");
         }
         else
         {
             MessageBox.Show("Please check your UserName and Password");
             textBox1.Text = "";
             textBox2.Text = "";
         }
     }
     else if (textBox1.Text.Length == 6)
     {
         if (sbl.IsValidCSStudent(textBox1.Text, textBox2.Text))
         {
             loginUserName = textBox1.Text;
             department    = "CS";
             this.Hide();
             StudentPage sp = new StudentPage(loginUserName, department);
             sp.Show();
             MessageBox.Show("LogIn Successful");
         }
         else if (sbl.IsValidEEEStudent(textBox1.Text, textBox2.Text))
         {
             loginUserName = textBox1.Text;
             department    = "EEE";
             this.Hide();
             StudentPage sp = new StudentPage(loginUserName, department);
             sp.Show();
             MessageBox.Show("LogIn Successful");
         }
         else if (sbl.IsValidBBAStudent(textBox1.Text, textBox2.Text))
         {
             loginUserName = textBox1.Text;
             department    = "BBA";
             this.Hide();
             StudentPage sp = new StudentPage(loginUserName, department);
             sp.Show();
             MessageBox.Show("LogIn Successful");
         }
         else
         {
             MessageBox.Show("Please check your UserName and Password");
             textBox1.Text = "";
             textBox2.Text = "";
         }
     }
     else
     {
         MessageBox.Show("Please check your UserName and Password");
         textBox1.Text = "";
         textBox2.Text = "";
     }
 }