Passing database data from one view to another in a MVC appliaction

Thank you, let me try

Using this method would the presence of the lead be recorded on the contact record? 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Rendering;
using Microsoft.EntityFrameworkCore;
using QUESTCRM.Data;
using QUESTCRM.Models;

namespace QUESTCRM.Controllers
{
    public class ContactsController : Controller
    {
        private readonly ApplicationDbContext _context;

        public ContactsController(ApplicationDbContext context)
        {
            _context = context;
        }

        // GET: Contacts
        public async Task Index()
        {
              return _context.Contacts != null ? 
                          View(await _context.Contacts.ToListAsync()) :
                          Problem("Entity set 'ApplicationDbContext.Contacts'  is null.");
        }

        // GET: Contacts/Details/5
        public async Task Details(int? id)
        {
            if (id == null || _context.Contacts == null)
            {
                return NotFound();
            }

            var contacts = await _context.Contacts
                .FirstOrDefaultAsync(m => m.ContactId == id);
            if (contacts == null)
            {
                return NotFound();
            }

            return View(contacts);
        }

        // GET: Contacts/Create
        public IActionResult Create()
        {
            return View();
        }

        // POST: Contacts/Create
        // To protect from overposting attacks, enable the specific properties you want to bind to.
        // For more details, see http://go.microsoft.com/fwlink/?LinkId=317598.
        [HttpPost]
        [ValidateAntiForgeryToken]
        public async Task Create([Bind("ContactId,FirstName,LastName,CompanyName,Telephone,Mobile,email,WorkEmail,Address1,address2,Town,State,Postcode,ContactType,AccountsRef,CustomerPortal,AccessDocs,PortalEmail,PortalPassword,ContactComments,LeadId")] Contacts contacts)
        {
            if (ModelState.IsValid)
            {
                _context.Add(contacts);
                await _context.SaveChangesAsync();
                return RedirectToAction(nameof(Index));
            }
            return View(contacts);
        }

        // GET: Contacts/Edit/5
        public async Task Edit(int? id)
        {
            if (id == null || _context.Contacts == null)
            {
                return NotFound();
            }

            var contacts = await _context.Contacts.FindAsync(id);
            if (contacts == null)
            {
                return NotFound();
            }
            return View(contacts);
        }

        // POST: Contacts/Edit/5
        // To protect from overposting attacks, enable the specific properties you want to bind to.
        // For more details, see http://go.microsoft.com/fwlink/?LinkId=317598.
        [HttpPost]
        [ValidateAntiForgeryToken]
        public async Task Edit(int id, [Bind("ContactId,FirstName,LastName,CompanyName,Telephone,Mobile,email,WorkEmail,Address1,address2,Town,State,Postcode,ContactType,AccountsRef,CustomerPortal,AccessDocs,PortalEmail,PortalPassword,ContactComments,LeadId")] Contacts contacts)
        {
            if (id != contacts.ContactId)
            {
                return NotFound();
            }

            if (ModelState.IsValid)
            {
                try
                {
                    _context.Update(contacts);
                    await _context.SaveChangesAsync();
                }
                catch (DbUpdateConcurrencyException)
                {
                    if (!ContactsExists(contacts.ContactId))
                    {
                        return NotFound();
                    }
                    else
                    {
                        throw;
                    }
                }
                return RedirectToAction(nameof(Index));
            }
            return View(contacts);
        }

        // GET: Contacts/Delete/5
        public async Task Delete(int? id)
        {
            if (id == null || _context.Contacts == null)
            {
                return NotFound();
            }

            var contacts = await _context.Contacts
                .FirstOrDefaultAsync(m => m.ContactId == id);
            if (contacts == null)
            {
                return NotFound();
            }

            return View(contacts);
        }

        // POST: Contacts/Delete/5
        [HttpPost, ActionName("Delete")]
        [ValidateAntiForgeryToken]
        public async Task DeleteConfirmed(int id)
        {
            if (_context.Contacts == null)
            {
                return Problem("Entity set 'ApplicationDbContext.Contacts'  is null.");
            }
            var contacts = await _context.Contacts.FindAsync(id);
            if (contacts != null)
            {
                _context.Contacts.Remove(contacts);
            }
            
            await _context.SaveChangesAsync();
            return RedirectToAction(nameof(Index));
        }

        private bool ContactsExists(int id)
        {
          return (_context.Contacts?.Any(e => e.ContactId == id)).GetValueOrDefault();
        }
    }
}

using System.ComponentModel.DataAnnotations;
using System.ComponentModel;

namespace QUESTCRM.Models
{
    public class Contacts
    {
        [Key]
        public int ContactId { get; set; }

        [DisplayName("First Name")]
        [Required]
        public string FirstName { get; set; }

        [DisplayName("Last Name")]
        [Required]
        public string LastName { get; set; }

        [DisplayName("Company Name")]
        public string? CompanyName { get; set; }

        [DisplayName("Main Telephone")]
        public string? Telephone { get; set; }

        [DisplayName("Mobile")]
        public string? Mobile { get; set; }

        [DisplayName("Main Email")]
        public string? email { get; set; }

        [DisplayName("Work Email")]
        public string? WorkEmail { get; set; }

        [DisplayName("Address 1")]
        public string? Address1 { get; set; }

        [DisplayName("Address 2")]
        public string? address2 { get; set; }

        public string? Town { get; set; }

        [DisplayName("County / State")]
        public string? State { get; set; }

        [DisplayName("Postcode / Zip")]
        public string? Postcode { get; set; }
        [DisplayName("Contact Type")]

        [Required(ErrorMessage = "Please select a contact type.")]
        public ContractType ContactType { get; set; }

        [DisplayName("Accounts Ref")]
        public string? AccountsRef { get; set; }

        [DisplayName("Customer Portal Access")]
        public bool CustomerPortal { get; set; }

        [DisplayName("Access to Docs")]
        public bool AccessDocs { get; set; }

        [DisplayName("Email")]
        public string? PortalEmail { get; set; }

        [DisplayName("Password")]
        public string? PortalPassword { get; set; }

        [DisplayName("Comments")]
        public string? ContactComments { get; set; }

        public string? LeadId { get; set; }
    }
}

Hello Spence,

Please try this one,

public class YourModel
{
    public string Key { get; set; }
}

First View :

public ActionResult FirstView()
{
    var model = new YourModel { Key = "Data to be passed here" };
    return RedirectToAction("SecondView", model);
}

Secon View :

public ActionResult SecondView(YourModel model)
{
    return View(model);
}