How to get pass this error? Sqlexception:string or data be truncated?

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SQL-Server

database

C#5.0

, +

Hi Team

I have a method on my controller to save fields from the form. But its throwing this error each time. I need some help mates to resolve it, thanks.

What I have tried:

// Controller
<pre>  //GET:TrainingRegForm/Create/WebRequest.
        [HttpPost]
       
        public ActionResult SubmitRegDetails(RegViewAndRoleViewModel eNtsaRegistration)
        {
           

            if(ModelState.IsValid)
            {
                eNtsaRegistration.RegForm.Id = Guid.NewGuid();
                db.eNtsaRegForms.Add(eNtsaRegistration.RegForm);
                db.SaveChanges();
                return RedirectToAction("SaveRegForm");
            }
            return View(eNtsaRegistration);
            
        }

// DB columns fields with data types

ID(uniqueidentifier not null) PK
Title nvarchar(10) not null
FirstName nvarchar(15) not null
LastName nvarchar(25) not null
Position nvarchar(15) not null
Company nvarchar(35) not null
StreetAddress nvarchar(Max)) not null
StreetAddressLine nvarchar(Max))
City nvarchar(35) not null
StateProvince nvachar(45) not null
ZipCode int not null
Country nvarchar(30) not null
Email nvarchar(30) not null
CellNumber int not null
DietaryRequirement nvarchar(10) not null