using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;

public partial class Sign_Up_SignUpMain_1_ : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    protected void btnNext_Click(object sender, EventArgs e)
    {
        string str = "Data Source=(LocalDB)\MSSQLLocalDB;";
        str += "AttachDbFilename=|DataDirectory|Database.mdf;";
        str += "Integrated Security= True";
        string email, userName;
        //Page
        if (Page.IsValid == true)
        {
            email = txtEmail.Text;
            userName = txtUserName.Text;
            SqlConnection c = new SqlConnection(str);
            SqlCommand sqlCommand = new SqlCommand("INSERT INTO [Table] (Email, UserName) VALUES (@email, @userName);", c);
            sqlCommand.Connection = c;
            sqlCommand.Parameters.AddWithValue("@email", email);
            sqlCommand.Parameters.AddWithValue("@userName", userName);
            c.Open();
            sqlCommand.ExecuteNonQuery();
            c.Close();
            Response.Redirect("SignUp(2).aspx", true);
        }
        //Email
        if (rfvEmail.IsValid == false || revEmail.IsValid == false)
        { txtEmail.CssClass = "txtError"; }
        else
        { txtEmail.CssClass = "Text"; }
        //User Name
        if (rfvUserName.IsValid == false || revUserName.IsValid == false)
        { txtUserName.CssClass = "txtError"; }
        else
        { txtUserName.CssClass = "Text"; }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;

public partial class Sign_Up_SignUp_2_ : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    protected void btnNext_Click(object sender, EventArgs e)
    {
        string str = "Data Source=(LocalDB)\MSSQLLocalDB;";
        str += "AttachDbFilename=|DataDirectory|Database.mdf;";
        str += "Integrated Security= True";
        string password;
        //Page
        if (Page.IsValid == true)
        {
            password = txtPass.Text;
            SqlConnection c = new SqlConnection(str);
            SqlCommand sqlCommand = new SqlCommand("INSERT INTO [Table] (Email, UserName) VALUES (@email, @userName);", c);
            Response.Redirect("SignUp(3).aspx", true);
        }
        //Password
        if (revPass.IsValid == false || rfvPass.IsValid == false)
        { txtPass.CssClass = "txtError"; }
        else
        { txtPass.CssClass = "Text"; }
        //Confirm Password
        if (rfvConPass.IsValid == false)
        { txtConPass.CssClass = "txtError"; }
        else
        { txtConPass.CssClass = "Text"; }
        //Compare Passwords
        if (cvPasswords.IsValid == false)
        {
            txtPass.CssClass = "txtError";
            txtConPass.CssClass = "txtError";
            txtPass.Text = "";
            txtConPass.Text = "";
        }
        else
        {
            txtPass.CssClass = "Text";
            txtConPass.CssClass = "Text";
        }

    }
}