protected void EnterUserButton(object sender, EventArgs e) { enter obj = new enter(); String uname = Textbox1.Text; if (string.IsNullOrEmpty(uname)) { Error1.Text = "Username cannot be null."; return; } String password = Textbox7.Text; bool check1 = false; bool check2 = false; if (string.IsNullOrEmpty(password)) { Error2.Text = "Password cannot be null."; return; } else { for (int i = 0; i < password.Length; i++) { if (password[i] >= '0' && password[i] <= '9') { check1 = true; } else if (password[i] >= 'A' && password[i] <= 'Z') { check2 = true; } } if (check1 == false || check2 == false) { Error2.Text = "You have given an invalid Password. Try again."; return; } } String name = Textbox2.Text; if (string.IsNullOrEmpty(name)) { Error3.Text = "Name cannot be null."; return; } String email = Textbox3.Text; if (string.IsNullOrEmpty(email)) { Error4.Text = "Email cannot be null."; return; } String country = Textbox4.Text; if (string.IsNullOrEmpty(country)) { Error5.Text = "Country cannot be null."; return; } String cellno = Textbox5.Text; String bdate = Textbox6.Text; if (string.IsNullOrEmpty(bdate)) { Error6.Text = "Birth-date cannot be null."; return; } DataTable DT = new DataTable(); int found; found = obj.EnterUser(uname, password, name, email, bdate, country, cellno, ref DT); if (found == -1) { Error1.Text = "Sorry! Username already exists. Try again."; } else { Response.Redirect("loginpage.aspx"); } }